This is odd. To me exFrames=2 looks the best, the future sprite is mostly synced with mouse cursor. At exFrames=1 the red sprite is lagging a bit, but 3 and 4 is definitely too much!
But there's definitely something weird going on. When I try to record the screen with OBS, it captures two cursors! The "phantom" smaller cursor is usually ahead:
I'm guessing Windows or Chrome (or both) does something to smooth/enhance the mouse movement. Perhaps it works differently on different machines, DPI, frame rates etc..