[Webkit-unassigned] [Bug 228298] powerPreference may not be working correctly in WebGL's Metal backend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228298

--- Comment #3 from Marcin Ignac <marcin.ignac at gmail.com> ---
I did manage to make it use high end gpu on my old laptop but can't make it work on MBP16. After upgrading macOS and Safari on my old laptop performance degraded.

How to replicate: 
1. Open http://projects.variable.io/webgl/shader-performance/ (noise based particle animation)
2. Open Activity Monitor and then GPU History

MacBook Pro (16-inch, 2019), macOS BigSur 11.5
- Safari 14.1.2 -> Intel UHD Graphics 630, 10fps unresponsive UI
- Chrome 92 -> AMD Radeon Pro 5600M, 60fps
- Firefox 90 -> AMD Radeon Pro 5600M, 60fps

Things like being plugged in and Automatic Graphic Switching on/off don't seem to make a difference. Also when i have Chrome using Radeon PRo 5600M and open Safari with the link above then Intel UHD kicks in anyway

MacBook Pro (15-inch 2017), macOS BigSur 11.0.1
- Safari 14.0.1 → AMD Radeon Pro 560, 60fps
- Chrome 92 -> AMD Radeon Pro 560, 60fps

After upgrading to macOS BigSur 11.5.1
MacBook Pro (15-inch 2017), macOS BigSur 11.5
- Safari 14.1.2 → Intel HD GRaphics 630, 20fps, unresponsive UI 
- Chrome 92 -> AMD Radeon Pro 560, 60fps

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