[dsissitka]

You might like Typometer. I believe it was created by a JetBrains developer to improve input latency in IDEA.

> Typometer works by generating OS input events and using screen capture to measure the delay between a keystroke and a corresponding screen update. Hence, the measurement encompasses all the constituents of processing latency (i. e. OS queue, VM, editor, GPU pipeline, buffering, window manager and possible V-Sync).

https://pavelfatin.com/typing-with-pleasure/