I was investigating youtube HTML5 case and found that we rebuilding layer tree every 1-5 seconds (on mobile much often), and that is causing ShadowImageLayers Create/Destroy thingy, which consume bunch of CPU, breaking A/V sync (triggering framedrop) et.c. Here is backtrace: http://pastebin.mozilla.org/1332242 Can we fix it somehow in FrameLayerBuilder?
Can you reproduce it in a reduced testcase?
Need to prepare it first, but it looks like some transparent text (video info/comments/ads) causing this
platform-rel: ? → ---
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