Chrome is slow

[jvilk]

It appears we are hitting a bug in Chrome:
https://code.google.com/p/chromium/issues/detail?id=170021

We get decent FPS in other browsers (IE/FF/Opera). Chrome needs to get its stuff together.

[perimosocordiae]

You might also try to keep track of which canvases need updating, to improve speed across the board.

[jvilk]

That's hard to do. I would have to understand the semantics of every canvas function call. There doesn't appear to be an easy way to check if a portion of the canvas has changed.