Improve FPS for faster input

[crashingstatic]

Semaphore starts to skip letters at ~100 WPM.

[everythingishacked]

That's around 8.3 characters per second, so should be fine so long as FPS is about twice that, unless the camera blurs motion too much to pick up a clear pose. I'm getting roughly 30 FPS on a Mac M2's built-in webcam, although big cross-body motions can sometimes be missed going that fast.

It's probably possible to do some further fine-tuning on the OpenCV side to get a higher frame rate, although that's far from my area of expertise.

Any specific hardware specs to share?