SkiaGL is at least 10x slower than Skia when preparing graphics in the Shumway Mushroomer game: Steps to Reproduce: Visit: http://www.areweflashyet.com/Mushroomer Make sure App, Sys & Verifier buttons are toggled. It may take a while for the game to download. Once it says "prepare graphics" SkiaGL is way slower than Skia or Cairo. I believe the game is caching vector shapes into bitmaps during this stage.
Michael will measure current SkiaGL perf as a possible canvas backend.
This Shumway bug is no longer relevant.