[Webkit-unassigned] [Bug 239518] New: ANGLE_instanced_arrays has poor performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239518

            Bug ID: 239518
           Summary: ANGLE_instanced_arrays has poor performance
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: oconnorct1 at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

I'm on MacOS Monterey 12.3 (21E230)
MacBook Pro (15-inch, 2017)
Radeon Pro 560 4 GB
Intel HD Graphics 630 1536 MB

After getting feedback from Kenneth Russel I was going to try and find time to build a demo of why instanced arrays perform poorly in both WebGL and WebGL2 but I found an example online that drops frame rates with a very basic low CPU/GPU effort example.

Initial discussion
https://bugs.webkit.org/show_bug.cgi?id=205663

A blog discussing the use of instanced arrays:
https://blog.tojicode.com/2013/07/webgl-instancing-with.html

The example:
http://media.tojicode.com/webgl-samples/instancing.html

If you full screen in safari and move around (click down and drag), you will see Safari performs poorly with instanced arrays.

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