(In reply to Kelsey Gilbert [:jgilbert] from comment #2) > Can you go into more detail why? There is a case that wait happens at [mVideoSwapChain->Present(0, 0);](https://searchfox.org/mozilla-central/rev/006f28c4f81c487e6382b5460deee9ed8f4e5aa0/gfx/webrender_bindings/DCLayerTree.cpp#1103) See https://bugzilla.mozilla.org/show_bug.cgi?id=1792015#c27
Bug 1818685 Comment 3 Edit History
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(In reply to Kelsey Gilbert [:jgilbert] from comment #2) > Can you go into more detail why? There is a case that wait happens at [mVideoSwapChain->Present(0, 0);](https://searchfox.org/mozilla-central/rev/006f28c4f81c487e6382b5460deee9ed8f4e5aa0/gfx/webrender_bindings/DCLayerTree.cpp#1103) See https://bugzilla.mozilla.org/show_bug.cgi?id=1792015#c27 I wonder if the wait might be related to a lot of tiles usage in DCLayerTree.