Sim freezes momentarily while camera activates

[KatieWoe]

Test device
Dell
Operating System
Win 11
Browser
Chrome
Problem description
For phetsims/qa#831
When starting the sim with the camera inputs, the sim seems frozen for up to a few seconds and clicking or mousing over things don't seem to work. The sim then starts and runs smoothly. I suspect the camera is activating at this time, but it isn't necessarily obvious.

Troubleshooting information:

Details

!!!!! DO NOT EDIT !!!!!
Name: ‪Ratio and Proportion‬
URL: https://phet-dev.colorado.edu/html/ratio-and-proportion/1.2.0-dev.31/phet/ratio-and-proportion_all_phet.html?cameraInput=hands
Version: 1.2.0-dev.31 2022-08-24 16:50:40 UTC
Features missing: applicationcache, applicationcache, touch
Flags: pixelRatioScaling
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36
Language: en-US
Window: 1280x649
Pixel Ratio: 1.5/1
WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium)
GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium)
Vendor: WebKit (WebKit WebGL)
Vertex: attribs: 16 varying: 30 uniform: 4096
Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32)
Max viewport: 32767x32767
OES_texture_float: true
Dependencies JSON: {}

[zepumph]

Yea. I'm not sure if there is any way around this. The sim freezes because it loads the media pipe library content. I can experiment with using asyncLoader locks, but we will need/want to have an offline dialog after the load time if internet is off. So I'll need to take a closer look.

[zepumph]

@emily-phet, for this release, is it acceptable that there is a ~2 second freeze after the sim has started up because of media pipe initialization? I am happy to investigate further if you think it blocks this publication.

[emily-phet]

We'll describe this as a feature still in development any place we're sharing the query parameter to access it, so a short freeze is acceptable. This should not block publication.