Draw circles on the checking area continuously with your mouse/touch/pen for a few seconds.
To ensure mouse movement unadjusted, you may either press-hold right mouse button in Chromium browser, or disable mouse acceleration for your OS.
[Firefox] Timestamps of uncoalesced pointermove events seem to be vsync'ed thus are not accurate.
[Chromium] To show also vsync'ed pointermove events, please keep browser DevTools closed.
[HTTP server] Enable cross-origin isolation for hi-res timing.
On secondary monitor, frame rate stat may not match screen refresh rate.
In power saving mode, frame rate stat may not match screen refresh rate.