Performance · 2026-04-08
Controller input lag
A 4 ms wired age and a 20 ms Bluetooth age is a real difference. A 2 ms gap is noise.
What to check first
The latency test subtracts the gamepad timestamp from the page clock when the browser allows it. That is not your television. Use USB when milliseconds matter, keep the tab focused, and remove remappers you are not using. The display’s game mode still matters, and it will not move this number.
- Compare one pad to itself, USB against Bluetooth.
- A timestamp the browser cannot compare shows a dash, not a fake millisecond.
- Polling rate is how often samples arrive. Age is how stale the latest one is.
Confirm the reading on the live tester before you buy parts or change firmware. The number on that page is what your browser actually receives.
A practical next step
Repeat the same test after each change and write the resting radius down. A fix that does not move that number did not fix the sensor. If the offset stays above about 0.12 with your hands off the sticks, plan a module replacement rather than another software pass. Model notes live in the controller library.
Frequently asked questions
Does this page change my controller?
No. GamepadTesters only reads the Gamepad API in your browser. Calibration writes, firmware updates, and stick swaps happen in the maker’s tool or at a repair bench.