There are a ton of runnables, and the Windows event loop probably has more overhead per runnable than necessary. The most actionable step would be to cut down on the number of runnables. In the first profile, I see 8600 ProxyRelease runnable from [`FeatureHolder`](https://searchfox.org/mozilla-central/rev/9dd09bebbff975e6b0fdabe0032753fcc3176e4f/toolkit/components/url-classifier/nsUrlClassifierDBService.cpp#234-239). This is coming from nsUrlClassifierDBService. This seems excessive. Who knows about the URL classifier? Do we expect it to be active to this degree for reddit.com?
Bug 1907701 Comment 2 Edit History
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There are a ton of runnables, and the Windows event loop probably has more overhead per runnable than necessary. The most actionable step would be to cut down on the number of runnables. In the first profile, I see [8600 ProxyRelease runnables](https://share.firefox.dev/4f0Vegf) from [`FeatureHolder`](https://searchfox.org/mozilla-central/rev/9dd09bebbff975e6b0fdabe0032753fcc3176e4f/toolkit/components/url-classifier/nsUrlClassifierDBService.cpp#234-239). This is coming from nsUrlClassifierDBService. This seems excessive. Who knows about the URL classifier? Do we expect it to be active to this degree for reddit.com?