[Webkit-unassigned] [Bug 220827] New: Slow layout and high CPU usage when visiting a web page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220827

            Bug ID: 220827
           Summary: Slow layout and high CPU usage when visiting a web
                    page
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cipang at outlook.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When visiting this page: https://ninjarockstar.dev/css-hex-grids/ and scroll down, the content shows up slowly (need to wait a few seconds) and a high CPU usage of the process is observed during rendering the content.

Tried Chrome and Firefox on the same machine, and they don't have the same slow issue.

I agree that the CSS is complicated on this page but it might be something that worths to look into if other browsers do not have the same issue. Your help is much appreciated.

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