Resizing the browser window with https://data.firefox.com/dashboard/hardware open uses 100% CPU load for about 20s
Categories
(Core :: Performance: Responsiveness, defect)
Tracking
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People
(Reporter: whimboo, Unassigned)
Details
(Keywords: perf)
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:146.0) Gecko/20100101 Firefox/146.0 ID:20251028215909
Opening the DevTools inspector with the Cmd+Option+I shortcut on https://data.firefox.com/dashboard/hardware causes 100% CPU load for about 20s. Until then a user also has to wait until anything is displayed in the inspector (or any other) panel. The content process is frozen during this time.
Here a recorded Gecko profile: https://share.firefox.dev/47zH7Nz
The flame chart shows that we spent nearly all the time in SVGGeometryElement.getPointAtLength, which itself is part of a request animation frame callback.
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Reporter | |
Comment 1•3 days ago
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As Julian mentioned to me this is actually not a DevTools issue but also happens when resizing the browser window. When DevTools is opened this is what basically happens with the content area. It's not visible when opening DevTools in a separate window.
Not sure if this is an issue with the page itself or us not handling it correctly. CC'ing Emilio in case he has an idea.
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Comment 2•3 days ago
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Not sure if this is an issue with the page itself or us not handling it correctly
FWIW, I see the same with Chrome.
Description
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