wasm demo performance isn't as 60 as it claims

[adsick]

Love egui, but https://emilk.github.io/egui/index.html actually runs with 40-50 fps when one window is opened, and it drops down to 25 fps when i open all the windows.

hardware: i5-3330 8g ram, amd Radeon R9-280x
software: Fedora 33 Firefox 85.

[emilk]

Yeah, Firefox does not implement WebGL very well. Out of my control unfortunately: https://twitter.com/fedor_games/status/1342838418343141381 https://t.co/UlnjSlw91Q?amp=1

[lancecarlson]

@emilk Sorry to bring this issue back from the grave, but I also noticed some performance issues on Chrome on my MacOS laptop (Firefox is worse). I compiled the demo on my local machine to see if there were improvements, and there were, but there is still a tiny noticeable lag (on the hover effect) and CPU bounces to 50% on a regular basis. If I unfocus the window and let it relax, the CPU goes all the way down to 0 again. I tried to compile in release mode to see if it helped. I think that dragged the CPU down to around 10%, but hover my mouse over things in the demo is still delayed.

Any idea what be the issue?

BigSur 11.6
Model Name: MacBook Pro
Model Identifier: MacBookPro11,4
Processor Name: Quad-Core Intel Core i7
Processor Speed: 2.2 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Hyper-Threading Technology: Enabled
Memory: 16 GB

[emilk]

Try running the in-browser profiler and see if you can spot something. Certainly you should compile in release.

I know there is room for improvement in the painter - you can try using the glow painter instead, it is reportedly much faster than the WebGL based painter: #868 (comment)