Network Investigation
Higher latency at night does not always mean the route is broken.
Often, China has simply entered one of its busiest daily usage periods. Even if it is still daytime where you live, China-side evening peak load can still affect China game performance.
When playing China games from overseas, the important time zone is not always your local time. It may be China time.
When many players in China come online at night, home broadband, residential networks, ISP exits, game servers and cross-border paths can become busier. That can increase latency, jitter and packet loss for overseas players too.
China's evening is often the busiest time for gaming, video, live streaming, downloads and social apps.
If you are in Europe, North America, the Middle East, Africa or another region, your local network may not have changed much. But the China-side destination path may have become busier.
Do not look only at your local clock, and do not rely only on speed tests.
Record China time, in-game ping, jitter, packet loss, server behavior and the difference between China's daytime and China's evening hours on the same route.
Time-zone difference is often ignored when overseas players troubleshoot China game lag.
Your local network may look unchanged. But when China enters evening peak usage, the game server side, China-side ISP paths and cross-border route segments may all become busier.