[Webkit-unassigned] [Bug 223100] New: WebGL drawElements slow in Safari 14

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223100

            Bug ID: 223100
           Summary: WebGL drawElements slow in Safari 14
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yegor.jbanov at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Safari 14 is noticeably slower than Chromium-based browsers when running CanvasKit (a WebGL-based canvas library).

The issue can be reproduced on https://skia.org/user/modules/canvaskit

According to the timeline, most of the time is spent in https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/drawElements (see attached screenshot from the Web Inspector).

This is also reproducible in Flutter apps that use CanvasKit:

- https://gallery.flutter.dev
- https://flutterplasma.dev/showroom/5

All of them point to `drawElements`.

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