Protocols and routes
Technical guide

Connection layers: distinguish protocols from routes

A single visit can involve more than one connection

When you open a web page, the browser first identifies the destination, then follows the system and app proxy settings to decide where the request goes. The client may receive traffic through the system proxy or through a virtual network interface that captures traffic matching its rules. The selected outbound protocol then sends the request to a remote server, which accesses the destination site and returns the response. A slow page can result from any link in this chain; the node name alone does not explain it.

At a minimum, distinguish the app request, the proxy connection and the network route. The app request is about whether the destination responds. The proxy connection handles authentication, encryption and forwarding. The route determines which networks the data crosses, whether they are congested and how traffic reaches the exit. The same protocol can perform very differently over different routes; changing protocols on the same route may leave the main bottleneck untouched. When comparing configurations, be clear about which layer changed.

What subscriptions, rules and DNS each do

A subscription is how a client obtains nodes and related settings; it is not a communications protocol. After importing one, the client still has to parse the supported fields, build a usable outbound configuration and apply rules to decide which connections use it. Nodes with the same name can behave differently across clients because transport fields, DNS policies or rule interpretation differ. Before troubleshooting, make sure the configuration loaded successfully rather than just checking whether a name appears in the list.

DNS resolves domain names to addresses, but where that resolution happens depends on the client mode, rules and app behavior. A browser may use its own encrypted DNS, while the system may retain an older cache. As a result, the exit may have changed while some domains still resolve through a different path. Check the DNS route and traffic rules before switching protocols. Repeatedly changing nodes may temporarily bypass a cached result without addressing the cause.

Break “connected” into observable stages

When a client shows “connected,” it usually means the proxy process, virtual interface or a session is active—not that the destination service has accepted a request. Next, check the exit location, DNS resolution and access from the actual app. If web pages work but a desktop app does not, first check whether that app uses the system proxy. If every app fails, investigate the local entry point, remote handshake and subscription status. This helps avoid repeatedly changing settings at the wrong layer.

“Slow” also needs a more precise description. A long delay before a page starts loading may point to DNS or the handshake. If the page shell appears but images do not, different domains may be following different rules. A file that starts quickly and then slows down may indicate congestion or a speed limit at the destination. A reproducible description of what happens is more useful than a vague speed rating, and makes it easier to compare route changes later.

Compare configurations without mixing variables

Keep your working configuration, then select another outbound connection to compare using the same device, network and target app. Change only one variable—protocol or node—per test, and note the client mode. If you enable a virtual interface, replace DNS, change regions and switch protocols all at once, even a better result will not show which change helped. Reverting to the original configuration and checking whether the issue returns is an important way to test your conclusion.

The comparisons below cover general protocol design and do not guarantee that any implementation will always be faster. Actual options available through VPNFine depend on the panel and subscription. Check regions and route details on the servers page. To confirm that traffic is using the expected exit, read How to check your exit IP, DNS and per-app routing, then use your observations to find the relevant section.

Common protocols: where encryption, authentication and transport differ

Shadowsocks: a straightforward design, but implementation matters

Shadowsocks is designed for encrypted proxy forwarding. Common implementations handle stream and datagram traffic separately. Rather than putting every function into a single web-style session, it uses a relatively direct proxy-forwarding structure. Its security depends on the encryption method, key management and implementation quality—not just the protocol name. When importing a configuration, make sure the client recognizes the methods and parameters in the subscription. Do not change them arbitrarily just to clear an error.

A straightforward design does not guarantee the lowest resource use on every device. Hardware encryption support, the client core, data-copying methods and the number of concurrent connections all affect performance. Datagram forwarding also depends on cooperation between the client, server and access network. If web pages work but a voice app does not, check datagram support and app routing rather than assuming the whole connection is fine based on a successful web test.

VMess: authentication and encryption depend on a complete configuration

VMess is a proxy protocol with authentication and data-protection mechanisms that can use different underlying transports. Node fields may include a user ID, transport type and related parameters, as well as the server address. Configuration formats have evolved and can vary between implementations, so importing a complete subscription is safer than assembling settings by hand. An incorrect system clock can also affect authentication checks; include time synchronization when troubleshooting handshake failures.

When comparing VMess, separate the protocol from its outer transport. Adding WebSocket or TLS, for example, changes the connection setup, encapsulation overhead and requirements for intermediary devices. It is no contradiction for two VMess nodes to perform differently. Check whether they use the same transport, connect through different entry points or rely on fields the client may not recognize. Comparing protocol labels alone will not produce a useful conclusion.

Trojan and VLESS: keep authentication and encryption distinct

Trojan typically uses TLS to establish a protected transport, then handles proxy authentication and forwarding within it. Certificate validation and the server name are therefore important. If a connection fails, check the device clock, certificate chain and server name provided in the subscription instead of disabling validation to force a connection. Disabling validation weakens the trust boundary and can hide an incorrect address or a connection to an unintended service.

VLESS is designed primarily for authentication and forwarding; it does not provide complete data encryption on its own, so it needs an appropriate secure transport. When evaluating a VLESS node, check the protection method and transport settings used around it. It is inaccurate to read “simple protocol fields” as “encryption is unnecessary,” or to equate VLESS itself with a particular secure transport. Whether the client supports the actual combination in the subscription matters more than support for the protocol name alone.

Compatibility often matters more than theoretical overhead

Desktop and mobile clients may use different cores and may not support the same subscription fields. If nodes are missing after import, or a node name appears but will not connect, first check the client's parsing and handshake errors to see whether a field was rejected. Do not fill missing fields with parameters from another protocol, or casually replace the server address with a certificate name. The server usually has to define how these parameters fit together.

Choose a combination that is compatible and can be reliably tested before comparing resource use and responsiveness. For everyday browsing and office apps, a mature implementation and a suitable route often matter more than how new a protocol is. VPNFine describes its service as using “military-grade encryption,” but technical security still depends on correct encryption settings, trusted software sources and valid authentication. No label can replace those checks.

QUIC protocols: choosing between Hysteria2 and TUIC

First, understand UDP, QUIC and reliable transport

UDP carries datagrams but does not provide ordering or retransmission by itself. QUIC builds secure connections, streams and reliable transport on top of UDP, bringing together work traditionally handled separately by the transport and security layers. So “uses UDP” does not mean an app must accept lost data, nor does it mean all traffic is sent unchanged as bare datagrams. To assess reliability, look at how the higher-level protocol handles each type of data.

QUIC can manage independent streams within one connection, so losing data on one stream need not block delivery on every other stream as it can with a single ordered byte stream. However, the streams still share route capacity and congestion feedback. A congested exit, wireless interference or a slow destination will not disappear just because QUIC is in use. For proxy traffic, how app connections map to streams and how datagrams are encapsulated depend on the specific implementation.

Hysteria2: match sending behavior to the actual network path

Hysteria2 uses QUIC for proxy transport. Its congestion control and sending behavior are key to understanding how it performs. In implementations that support them, bandwidth settings may affect sending decisions. Setting them as high as possible can cause data to queue at a bottleneck. Downloads may continue while web interactions, voice calls and other devices become noticeably slower. Follow the subscription and client instructions rather than copying settings from an unfamiliar screenshot.

Hysteria2 may perform well on some paths with packet loss or changing network conditions, but only if the network allows the required UDP traffic and the device can handle the processing. If a connection cannot be established, first check whether UDP is reachable on the same network, then investigate certificates, authentication and the address. A working TCP-based node does not prove the UDP path is working; the two can be affected by different network policies and resource scheduling.

TUIC: multiplexing and forwarding both affect performance

TUIC also uses QUIC for proxy communications and includes features such as connection multiplexing and datagram forwarding. The shared foundation does not make TUIC and Hysteria2 interchangeable. Authentication fields, client support, datagram handling and congestion-control options may differ. Compare complete, valid configurations for each protocol. Applying one protocol's client settings to another can cause failures that are difficult to explain.

For apps that handle many requests at once, multiplexing can reduce the work of repeatedly setting up outer connections, but it has trade-offs. An issue with the outer connection can affect all the activity it carries, and congestion on a shared route still affects everything using it. If multiple apps stall at the same time, consider the outer session and route status. If only one destination is affected, check that destination, traffic rules or exit compatibility.

Why they are not always faster than TCP

Access devices, carrier networks and public Wi-Fi may impose different restrictions on UDP. Some paths lose datagrams easily; others have short idle timeouts. To keep a connection alive, a client may send keepalives. If the network continually drops them, apps will reconnect and retry. In that case, switching to a stable TCP route may help more than continuing to tune QUIC settings.

On the other hand, when network quality is good and the destination interaction is simple, the time taken by the destination server may outweigh protocol differences. A single file download cannot tell you how every use case will perform. Throughput alone also says nothing about time to first response, long-lived connection stability or mobile battery use. Observe each separately and note the access network instead of labeling a protocol permanently fast or slow.

Most users can keep a configuration that works reliably and treat QUIC-based nodes as options to compare. Advanced users should first understand how their client defines sending parameters, idle timeouts and datagram modes. Unless you have a clear reason, keep the subscription settings, do not disable security checks and do not mistake a protocol mentioned in an explainer for a promise that VPNFine supports it on every platform and route.

Connections and resources: assess responsiveness, throughput and memory separately

A slow first response does not necessarily mean low sustained speed

What feels like a “slow page” may involve DNS lookup, local proxy handling, the remote handshake, the connection to the destination and app processing. Starting the client, switching nodes or returning after a connection has been idle often involves more setup work than reusing an existing connection. Before comparing protocols, establish whether you are measuring a cold start or ongoing use; mixing different connection states can lead to opposite conclusions.

TLS session resumption and connection reuse can avoid some repeated work, but whether they help depends on the server, client and session state. Protocol documentation does not mean every visit will resume a session, and clearing a cache before testing one route is not a fair comparison with another route that already has an established session. Instead, record the first visit after startup separately from subsequent visits, then identify where the difference occurs.

Throughput requires a sufficiently sustained workload

Small web pages are affected mainly by request round trips and server response times, while large files are more likely to reveal sustained throughput limits. A fast download does not mean web interactions will be fast, and a responsive page does not prove a long transfer will be free of queuing. The destination's delivery strategy, file caching and exit location all affect the result. To compare routes, use the same content and avoid comparing a cached download with a fresh one generated by the origin server.

Concurrent activity also changes what you observe. Multiple downloads can fill the link and make each individual task appear slower. Some apps automatically open multiple connections; others use just one. Without accounting for this, you may mistake app behavior for a protocol difference. During testing, pause background sync, app updates and other high-volume tasks, and note the normal network conditions so the results remain meaningful.

How CPU, memory and buffers interact

The client handles encryption and decryption, rule matching, data copying and connection management. Hardware encryption support, the client core and system scheduling can make the same protocol more or less demanding on different devices. When checking resource use, look for sustained proxy-process activity, device heat and concurrent foreground app usage. Do not attribute browser rendering or video decoding costs entirely to the proxy protocol.

Rules, DNS caches, connection state and transport buffers all use memory. Larger buffers can temporarily absorb differences in speed, but may extend queueing during congestion. More caching can reduce repeated work while using more resident memory. Higher memory use alone does not mean an implementation is inefficient, and lower use does not prove better responsiveness. Consider whether usage keeps growing, whether it drops after connections close and whether the system is under memory pressure.

Any change should have a clear reason and be reversible

Multiplexing, buffering and connection timeouts are interrelated settings. Multiplexing may reduce handshakes, but can also broaden the impact of a failure. A longer timeout can tolerate brief interruptions while keeping failed connections around for longer. Avoid changing these settings all at once without logs or a reliable way to reproduce the issue. Save the original configuration, note the expected improvement and test it with the same steps. If it does not help, revert.

On desktop, use the system's task manager to observe proxy and app processes; there is no need to install software from unknown sources just to measure resource use. Windows users should also distinguish system proxy mode from virtual interface mode. For more, read Windows system proxy and rule-based routing explained. The goal is not to score protocols, but to identify the main limitation in your device, route or app.

Mobile battery life: monitor wake-ups, reconnects and background activity

The protocol is only one part of battery use

On mobile devices, proxy use consumes power not only through encryption and decryption, but also through wireless communication, background wake-ups, app refreshes and retries. Screen brightness, signal quality and video playback can all mask differences between protocols. A client's share on the system battery screen also does not directly show how much extra power it uses: the system may attribute work forwarded through a virtual interface to that client.

With a weak signal, maintaining a connection can itself use more power. Frequent switching between Wi-Fi and mobile data can also trigger route changes and session recovery. A configuration that repeatedly reconnects may use more battery than one that stays connected, even if it has lower processing overhead in a static desktop test. When evaluating mobile performance, note the access method, signal conditions and whether the device is moving.

More frequent keepalives do not always mean a more stable connection

Keepalives maintain session state in network devices and help detect whether a connection is still active. Sending them too often increases traffic and wake-ups; waiting too long may allow some networks to discard an idle session, requiring a new connection for the next request. The right setting depends on the network and client implementation; there is no single answer for every device. Most users should start with the defaults provided by the subscription and client.

If the first request often times out after standby, first distinguish between the system suspending background activity, a lost network session and a disconnected destination service. If everything works as soon as the app comes to the foreground, system scheduling may be involved. If every app has to reconnect, the outer session may be the issue. If only one chat or office app fails, check its own background restrictions. Increasing keepalive frequency will not necessarily fix these different causes.

System background policies can change connection state

Android background restrictions vary by system and device settings, while iOS network extensions are managed by the system lifecycle. A mobile client may not be able to preserve every state that a desktop client can keep running. Check the relevant system settings to see whether the client is restricted, and avoid running network tools that conflict with each other. Download clients and subscriptions through the client download section in the user panel. The panel determines access based on account status.

After switching between Wi-Fi and mobile data, some QUIC implementations can use connection migration features, but that does not mean app requests will never be interrupted. Recovery can depend on the proxy implementation, server policy and system network extension. Existing app-level TCP sessions may not survive a change in the outer connection either. Check how quickly the connection recovers and whether apps report errors; the connection icon staying on is not enough.

How to compare battery use fairly

Choose similar usage sessions and keep the device, screen-on time, access network and foreground app as consistent as possible. Compare active use and recovery from standby separately; do not group video playback with reading plain text. Note whether the device heats up, reconnects frequently or reports background restrictions. If battery-share percentages change but the usage sessions differ, that is not enough to judge one protocol against another.

When connection stability and battery use compete, first reduce unnecessary background transfers, repeated subscription refreshes and overlapping network tools, then consider changing protocols. Repeated retries are usually more worth investigating than a successful connection. VPNFine has no device limit, so you can keep a configuration that suits each device's network. That does not mean every device needs to use the same protocol or that household bandwidth is no longer shared.

Network routes: direct, relayed and dedicated connections

The exit region is not the same as the actual route

The exit region is the location the destination site sees for your traffic; it does not describe the full path between your device and the exit. Choosing a Hong Kong exit does not mean your traffic travels directly to Hong Kong; a more distant exit may first connect through a nearby entry point. Node names often condense the entry point, exit or product category into a single label, so check the route details as well. Geographic distance matters, but cannot explain network round-trip time or stability on its own.

Routes can also be asymmetric: requests and responses may travel through different networks. Routing policies, peering arrangements and temporary traffic management can all affect performance. A good result at a particular time only shows that the route suited that use case then; it does not prove that it will always perform the same way. When comparing routes, note the access network and destination region, then cross-check route details against real app performance.

Direct routes: simpler paths, with quality determined by peering

A direct route usually means your device connects to the remote proxy entry without an extra relay configured by the service. This can reduce forwarding and management steps, but the quality of public-network peering remains critical. A direct route can work well when the path from your access network to the remote entry is suitable; cross-network congestion or detours can cause considerable variation. “Fewer steps” describes the route structure, not a guarantee of stability.

When a direct connection fails, distinguish an unreachable entry point from a port issue or a problem with the destination exit. If other entries in the same region work, the entry route may be at fault. If every entry can reach only some websites, check the connection from the exit to the destination. Do not confuse a destination site's access policy with a failure of the direct route, or repeatedly change local DNS before identifying where the problem is.

Relayed routes: an extra hop may provide a better path

A relay first sends data to an entry point, which forwards it to the exit. An extra forwarding step does not necessarily make a connection slower: it may replace a poor public-network route with better peering. A relay also adds connections and resources to maintain. Entry-point load, forwarding capacity or a problem on the relay-to-exit link can all affect performance. Relaying changes how the route is organized; it cannot remove physical distance or capacity limits.

When diagnosing a relayed route, use the symptoms to distinguish the entry segment from the rest of the path. If several exits using the same entry are affected, check the entry or shared link first. If only one exit fails to reach a particular destination, investigate compatibility between that exit and the destination. Users may not be able to observe every part of the internal route, so report reproducible symptoms to support rather than guessing where the internal fault lies from the node name.

Dedicated lines: know what they cover; do not overread the label

An IEPL dedicated line generally means that part of the route uses dedicated carriage, which can reduce uncertainty in some public-network peering. However, the connection from your network to the entry and from the exit to the destination may still use public networks. Check the service details for the exact boundaries. A dedicated line does not mean every segment is exclusively reserved end to end, guarantee that every content service accepts the exit or replace correct device and app settings.

Choose routes based on your access network, destination region and how you use the connection. Interactive apps depend on round-trip time and jitter; sustained transfers need stable throughput; region-specific content depends on the exit location and platform policies. VPNFine covers 90+ countries / 150+ routes. Check available regions and route types on the servers page. Broad coverage gives you more options, but cannot prove that a specific route is best for your device.

Packet loss and peak-time congestion: troubleshoot by symptoms

Understand packet loss, latency and jitter separately

Latency is the time data takes to make a round trip; jitter is variation in that time; packet loss means some data does not arrive as expected. With reliable transport, lost data is usually retransmitted, so you may not see an obvious error but can still experience pauses. Voice and real-time interactions are more sensitive to jitter, while file downloads can hide brief fluctuations through buffering and retransmission. A page loading eventually does not prove the route is stable.

Wireless interference, queues on access equipment, cross-network congestion and limited resources at the destination can all produce similar symptoms. Intermediate routers may also give diagnostic traffic a lower response priority, making a probe appear to lose packets even when regular traffic is forwarded normally. Treat route probes as clues and check how the destination app performs over time. A silent intermediate node is not enough to prove that it is dropping your traffic.

Why peak hours can bring more fluctuations

At peak times, demand for shared resources increases. This can affect home internet, Wi-Fi channels, public-network peering, proxy entries or the destination service. If any point reaches capacity, traffic may queue or get dropped. The node name, exit region and even protocol may stay the same while available capacity and queue conditions change. A single off-peak test cannot predict peak-time performance.

To identify congestion, look at when it happens and what it affects. If local services also slow down, check your access connection and home network first. If only proxied traffic is affected, compare entry points and routes. If only one content platform is slow, check the destination's status and exit compatibility. If changing regions helps, it shows that the new route or exit avoided the current issue; it does not prove the original protocol is defective.

Downloads can make queueing-related slowdowns more noticeable

When a connection's upstream or downstream capacity stays fully occupied, buffers in routers and other network devices can fill up. Downloads may still appear fast while web clicks and voice calls start lagging—a common sign of queueing. An aggressive sending strategy can also lengthen the queue at a bottleneck. Pause high-volume tasks and check whether interactions improve before changing sending settings; do not add more concurrent tasks.

In households, pay particular attention to background uploads. Cloud backups, photo uploads and file sharing can use access capacity continuously and affect other devices on the same network. VPNFine has no device limit, but shared network capacity is still finite. Device count and bandwidth are separate concerns. For details on family use, see Family sharing and device limits explained. Support for multiple devices does not mean each gets a separate internet connection.

A reproducible troubleshooting sequence

Keep the client state from when the issue occurred, and note the access method, target app, node and proxy mode. Then check whether your everyday internet works without the proxy and confirm your subscription and account status. If the local network is fine, switch to another known-working route for the same destination. If the issue persists, check the client logs to see whether the error involves DNS resolution, the handshake, authentication or the destination connection. The stage shown in the logs is usually more useful than a generic timeout message.

For suspected UDP path issues, compare with a working TCP configuration. For suspected entry congestion, compare different entries rather than just changing the exit name. If only one app fails, check its proxy support and traffic rules. After testing, undo unnecessary changes to avoid leaving behind global DNS or system proxy settings. To submit a support ticket, use the ticket section in the user panel and describe how to reproduce the issue. Do not share subscription URLs, authentication details or full logs containing personal data.

If an issue occurs only after sleep, revisit the mobile and system recovery sections. If the first request is always slow, review DNS resolution and connection setup. If interactions gradually slow once a transfer starts, check queueing and shared bandwidth. Matching symptoms to a specific branch reduces guesswork and helps support understand the scope of the issue without relying on subjective reports that cannot be reproduced.

Choosing a configuration for your use case

Web and office apps: start with consistent rules and exits

For web browsing and everyday office work, prioritize reliable connections, correct routing rules and destination compatibility. A browser working does not mean your meeting software, mail client or desktop editor is using the proxy. Check how each app connects before comparing nodes; changing the remote protocol cannot help an app that is not using the proxy. In a workplace, follow your organization's network and security requirements rather than changing existing settings without approval.

For sign-ins and long work sessions, a stable exit is often more important than chasing short-lived speed gains. Frequent region changes may trigger extra verification from a destination service or invalidate existing sessions. Once you find an exit that works well, keep it and have a compatible alternative for troubleshooting. A backup is for recovery and diagnosis, not for continuously rotating exits.

AI tools: distinguish connection issues, streaming responses and service eligibility

ChatGPT, Claude, Gemini and AI features in editors may use web pages, APIs and streaming connections. A page loading does not guarantee that generation will complete; an interrupted response may also be caused by an app timeout, the destination service or account permissions. First identify whether sign-in fails, the request cannot be sent, or the response starts and then stops. Follow the corresponding troubleshooting path instead of attributing every error to route speed.

For desktop tools such as Cursor, check whether the app reads the system proxy and whether its API requests match the right rules. The exit location must meet the platform's regional and account requirements; a proxy connection does not change those rules. A suitable configuration needs to support the app and maintain a stable connection. For more on this use case, see the AI acceleration guide. A protocol label alone does not determine whether the service is available.

Streaming and real-time apps have different priorities

Streaming depends more on sustained throughput and exit region, but content catalogs, resolution and playback permissions also depend on your platform account, licensing region and device capabilities. A successfully established protocol connection does not prove the platform accepts the exit. Check your account and content region first, then see whether playback is stable. If stuttering is caused by device decoding or local Wi-Fi, a dedicated line may not help. Confirm region access against the Streaming guide and actual route details.

Voice calls, meetings and other real-time interactions are more sensitive to jitter, packet loss and two-way communication. Even seemingly good average latency can hide occasional queueing that disrupts a conversation. Strong download performance does not guarantee that voice datagrams are forwarded correctly. Test sending and receiving in the actual app and confirm that the configuration supports the required traffic. If the network is unsuitable for UDP, look for a compatible option supported by the app instead of forcing mismatched settings.

Choose a subscription and protocol separately

Protocol choice answers “how does the connection work?”; plan choice answers “how much data do I need, and how is it billed?” VPNFine monthly plans are ¥9.9/month for 60GB, ¥18/month for 250GB and ¥28/month for 500GB. Data resets monthly on the activation date. If you upgrade mid-cycle, the price difference is prorated for the remaining days. Choose a monthly plan based on your ongoing usage, not simply because a protocol is promoted as needing a larger data allowance.

Data packages are ¥158/300GB, ¥358/1000GB and ¥658/3000GB. They last until used and never expire. VPNFine supports Alipay / WeChat Pay / USDT and offers a 30-day money-back guarantee. No email address is required to create an account—just a username and password. For full billing details, see the plans page. For guidance on longer-term use, read Long-term subscriptions vs. paying month to month. Technical terms do not replace billing rules.

Keep a record of why your configuration works for you

Once you choose a configuration, note the device platform, access network, client mode, protocol, route type and apps you tested. Windows / macOS / iOS / Android / Linux handle background activity and routing differently, so configurations do not need to match exactly. When something changes, reproduce the issue first, then work through this guide from app behavior and DNS to the connection and route. There is no protocol that is always best; a reliable choice is one you understand and know how to recover from.