[Webkit-unassigned] [Bug 236473] New: Large page that loads MathJax becomes unresponsive, only in Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236473

            Bug ID: 236473
           Summary: Large page that loads MathJax becomes unresponsive,
                    only in Safari
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: leetncamp at live.com

On this page, https://neurips.cc/Conferences/2019/Schedule, Safari becomes so laggy that it is unusable for about 25 seconds. This does not happen in Firefox, Chrome, or Edge.  During this period, it is difficult to use the filter controls at the top of the page. This page is large and I believe the problem comes from the performance of a javascript library called MathJax.  

Firefox's handling of this page is exemplary.

It's not a bug, but it's one of those cases where Safari doesn't do as well as it's competitors.

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