Ospi's most unscientific input lag tester

Place your mouse sensor over the box with checkered pattern on the right (might look grey with very high dpi monitor).

Pattern in the canvas is shifted every second which might get picked up by your mouse sensor as movement.

The program calculates the round-trip time from the canvas shift to registration of mouse movement.

Left-click mouse to change pattern scaling (canvas scales cycles from 1 -> 5).