WebRender recently got much slower in Firefox [0]. I haven't looked at the source yet, but if the bitmaps aren't all preallocated, then it'll run into this rep

WebRender recently got much slower in Firefox [0]. I haven't looked at the source yet, but if the bitmaps aren't all preallocated, then it'll run into this repeatedly. [0] https://treeherder.mozilla.org/perfherder/graphs?highlightAlerts=1&highlightChangelogData=1&highlightCommonAlerts=0&replicates=0&selected=87312,1964495950&series=mozilla-central,93432,1,13&series=mozilla-central,87324,1,13&series=mozilla-central,87312,1,13&series=mozilla-central,87336,1,13&timerange=5184000 https://treeherder.mozilla.org/perfherder/graphs?highlightAl...