Keyboard input causes severe frame stuttering during WebXR sessions on Quest 3

[nedtwigg]

Reproducer:

• three.js examples: vr / rollercoaster
• three.js examples: vr / handinput / cubes
• connect a keyboard to Quest 3 (USB or bluetooth, this is not a bluetooth-specific bug)
• press any letter, severe stutter even with no key listeners

If you use the Wolvic browser (Meta App store, no sideloading), the vr / rollercoaster example works fine during key presses. AFAICT Wolvic doesn't support hand tracking, so you can't test the handinput / cubes demo.

I tested in v81.1034 and in v83.1034 (PTC), same behavior both places. I also reported this with the "press meta 5 times" thing, not sure if those go anywhere or not.

Apologies if this is the wrong place. It's not a bug in iWSDK per-say, but important to devs using iWSDK making productivity-style apps targeting at quest users. If there is somewhere better to report please let me know :)