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Why Your VPN Is Slow in China Every Evening, and What Helps

China's international links fill up between 19:00 and midnight. Why evenings are slow, what our 30-day data shows, and which fixes really help.

Updated October 2026.

The short answer

Evenings are slow because millions of people in China go online after work and share the same international links, which fill up between about 19:00 and midnight China time. A VPN on a premium route helps most, followed by a cable instead of Wi-Fi, a router and the right route for your work. Switching servers and free VPNs do not.

Table of contents

Why does the internet in China slow down every evening?

Every evening, after work and school, a large part of China goes online at the same time: streaming, gaming, scrolling and calling family abroad. Chinese services cope well, because their servers are inside China. International traffic is different. It leaves the country over a limited set of international links run by the big carriers (China Telecom, China Unicom and China Mobile), and everyone's international traffic shares them.

When a shared link is full, it cannot hold data forever. It starts throwing some of it away. Each lost piece has to be sent again, and most apps slow themselves down sharply when they notice losses. That is why a download that ran fast at lunchtime crawls at 21:00, and why a video call that was clear in the afternoon starts to stutter.

Three things make evenings harder for VPN users:

  • Your VPN may use the same busy roads. A VPN sends your traffic to a server abroad. If that server is reached over the standard, most crowded international paths, your traffic waits in the same queue as everyone else's.
  • Home broadband uses the standard paths. The carriers also run premium international networks, but those are sold to businesses and data centres, not to individual homes.
  • Your Wi-Fi is busy too. In an apartment building, your Wi-Fi competes with your neighbours' networks, and they are all busiest at the same time.

In this article, "evening peak" means 19:00 to 23:59 China time (UTC+8), the same window we use in our own measurements.

What did older public measurements show?

Independent public data on this is old, and we have not found anything newer. Two studies are still the most useful:

  • ThousandEyes, about February 2017. Over two weeks of tests from China, the US and Hong Kong, traffic from China to US websites saw on average 6.9% packet loss and 218 ms latency, against 0.2% loss and 81 ms from Hong Kong. Latency from China to US sites followed a daily rhythm, from about 150 ms at quiet times to 300 ms at peaks. The lows came around 4 to 6 am, and the highs usually between 7 and 9 pm China time (ThousandEyes, about 2017).
  • APNIC blog, August 2020. A University of California, Riverside team tested more than 400 connections into China over 53 days. It found that 79% of the connections coming into China ran below 1 Mbps, that the slowdown followed daily patterns, and that in 71% of cases the bottleneck sat "deep in China" rather than at undersea cables. Traffic leaving China was fast and stable (APNIC, 2020).

Both are years old, and China's networks have grown since. Read them as evidence that the evening slowdown is real and long-standing, not as today's numbers.

What does our own network data show?

We looked at our network data for the 30 days to 19 October 2026, in China time. It records what customers' apps actually pulled through Throughwire, not the capacity of their line. Most moments online are light browsing, so it describes real use rather than a speed test.

Two things stand out.

Everyday working speed held up in the evening. For every hour in which a customer moved at least 100 MB, we take the busiest minute of real transfer in that hour. During the evening peak, the median of those was 100% of the median at other times across all our routes, and 98% on High Speed, our Los Angeles route. In plain terms, the speed people got while actually working did not fall in the evening.

The best bursts dipped. Each customer's top speed is their fastest confirmed reading inside a real transfer. In the evening, the median customer's top speed on High Speed was 50 Mbps, against 80 Mbps at other times. On Ultra, our Osaka and Singapore routes, it was 35 against 55 Mbps, from a much smaller group of customers.

Our network data, 30 days to 19 October 2026Evening (19:00 to 23:59)Other hours
Working speed, all routes100% of other hoursBaseline
Working speed, High Speed98% of other hoursBaseline
Median customer's top speed, High Speed50 Mbps80 Mbps
Median customer's top speed, Ultra35 Mbps55 Mbps

So the honest summary is that everyday work held steady and peak burst speed dipped. A large download will usually finish more slowly at 21:00 than at 10:00. A video call, a document sync or a web page should feel much the same.

Across the whole day, the median customer's top speed was 90 Mbps, and at least 20 customers reached or beat 335 Mbps in confirmed readings. The latest figures are on our network stats page.

What we have not published yet: measured latency, jitter and packet loss. Those decide how a call feels, so we cannot yet show you an evening curve for call quality.

Why does the route matter more than anything else?

The evening jam happens on shared international paths, far from your desk. Your VPN provider cannot change your home line, but it does choose how its servers connect into China. Servers reached over a carrier's premium international network avoid the most crowded queues.

The 2020 APNIC study noted that "all of the three state-owned ISPs have set up a premium transnational network", and that for China Telecom "the loss rate does decrease with the tier of networks". This is why the route is the single biggest lever you have. Throughwire's High Speed route connects into China over a premium route. In our data, working speed on that route held at 98% in the evening.

Distance alone does not decide it. In the same 2017 ThousandEyes benchmark, Hong Kong, right next door to mainland China, saw 0.2% loss to US sites against 6.9% from inside China. ThousandEyes concluded that "geographic distance is not the only factor impacting performance from China". Our guide to choosing between Los Angeles, Osaka and Singapore explains how this plays out for your route.

What helps in the evening, and what doesn't?

FixEffect in the eveningWhy
Use a VPN on a premium routeHelps a lotAvoids the most crowded international paths, which is where the evening jam happens.
Plug in a cable instead of Wi-FiHelps a little (a lot if your Wi-Fi is weak)Removes the neighbours' Wi-Fi from the picture. Calls get steadier.
Put the VPN on a routerHelps a littleEvery device shares one steady connection, and Chinese apps stay on your normal line instead of crowding the tunnel.
Choose the right route for your workHelps a lot for calls and remote workUltra's lower delay suits real-time work; High Speed suits streaming and downloads.
Move heavy work off a foreign eSIM or Hong Kong SIMHelps a lot, if you are on oneThose connections take a detour through Hong Kong first.
Run big uploads and backups outside 19:00 to 23:59Helps a littleYour calls stop competing with your own backups.
Buy a faster home broadband planHelps a littleIt raises your local ceiling, but the evening jam is further away.
Switch servers every five minutesDoes not helpEvery switch drops your calls and downloads, and the shared path stays the same.
Use a free VPNDoes not helpFree services have no income to pay for premium routes.

A router keeps Chinese apps such as WeChat, Alipay, Taobao, Bilibili and iQIYI on your normal connection, while Google, YouTube, Zoom, Slack, Netflix and ChatGPT go through Throughwire automatically. Our router setup guide for offices shows how it works.

What can you try tonight?

A short checklist, roughly in order of effort:

  1. Check your network. Open our network check page. If it names a foreign eSIM, a Hong Kong network or another VPN, switch back to your Chinese SIM or home Wi-Fi.
  2. Close any other VPN app. Two VPNs at once slow each other down. Only one should be on.
  3. Plug in a cable for the computer you use for calls, or sit closer to the router.
  4. Pause cloud backups and large downloads during calls. Photo backups and game updates can run in the background without you noticing.
  5. Pick the right route. High Speed for streaming, browsing and downloads. Ultra for remote desktop, SSH or calls where every millisecond counts, remembering that Ultra counts 2.5 times the data.
  6. Test at the same time on two evenings before drawing conclusions. One bad evening can be a one-off.

If it is still slow after that, contact us with the time it happened and the result from the network check page.

Does switching servers every few minutes help?

No. Each switch drops every open connection (your call, your upload, the page you were loading), and the app has to start again. If the jam is on the shared international path, a different server reached over the same path is no faster.

In our data, working speed on High Speed held at 98% in the evening. If your evenings feel much worse than that, look closer to home before blaming the server: Wi-Fi, a foreign SIM, another VPN, or a backup running in the background.

Are free VPNs any better in the evening?

No. Premium international routes cost more to run than standard ones, and a free service has no subscription income to pay for them. Evenings are exactly when the standard paths fill up, so that is when the difference shows most.

If you rely on your connection for work or family calls, choose a service that tells you how it connects into China and publishes figures you can check.

When Throughwire isn't the right choice

  • You only use Chinese apps in the evening. Streaming on iQIYI or chatting on WeChat needs no VPN at all.
  • Your company needs contracted bandwidth. Some companies need a cross-border line with a contract and paperwork for internal systems. Our guide to office internet options in China explains when that is the better answer.
  • You need a written speed guarantee. We publish what we measure, but we do not guarantee speed. A licensed leased line from a carrier is the way to get contracted bandwidth.
  • Your network blocks outbound connections. On some company and campus networks, no VPN works reliably. Use another network.

Common questions

What time is the internet slowest in China?

Usually between about 19:00 and midnight China time, when most people are online after work. An older ThousandEyes benchmark from about 2017 found latency to US sites usually peaked between 7 and 9 pm China time.

Is it my VPN or my internet connection?

Open a Chinese site such as Baidu or Bilibili with the VPN off. If that is slow too, the problem is your line or your Wi-Fi. If Chinese sites are fast and international ones are slow, the route is the likely cause.

Does Ultra help in the evening?

For real-time work, Ultra's lower delay can make calls and remote desktops feel more responsive. For downloads and streaming, High Speed reached higher top speeds in our data (50 Mbps in the evening for the median customer, against 35 Mbps on Ultra). Ultra also counts 2.5 times the data.

Will a router make my VPN faster?

A router does not change the international path, but it helps in the evening in other ways. It gives every device one steady connection, lets you use cables, and keeps Chinese apps off the tunnel.

Did your evening speed really not drop at all?

The everyday working speed did not drop: it was 100% of other hours across all routes and 98% on High Speed, in the 30 days to 19 October 2026. The best bursts did drop. On High Speed, the median customer's top speed was 50 Mbps in the evening and 80 Mbps at other times.

Details for your IT team

  • Route: High Speed (Los Angeles) uses China Telecom's premium CN2 GIA route into China. Ultra uses Osaka and Singapore and is billed at 2.5 times.
  • Working speed: for each user-hour on one route with at least 100 MB transferred, the busiest 60-second average inside a sustained transfer. Peak-hour consistency is the evening median divided by the median of all other hours, computed before rounding.
  • Top speed: each customer's fastest 5-second reading inside a real transfer, counted only when a neighbouring reading reached at least half its speed and the server's network card moved at least those bytes in the same half-minute. Isolated spikes never count.
  • Source: server telemetry, network stats methodology 1.3.0, 30 days to 19 October 2026 in China time. Latency, jitter, packet loss and availability are not published yet.
  • Router behaviour: QUIC (HTTP/3) to international sites is blocked on the router, so browsers fall back to HTTPS over TCP, which holds up better through the tunnel. Chinese destinations go direct.