Canvas HTML5性能-Chrome的运行速度明显比Firefox和IE慢

Question

I have written a game using HTML5 and Javascript. The game can be played at www.be-sw.com/game/2. I don't think posting the code here will be helpful as it is lengthy. It uses two loops; a game logic loop and a request animation frame loop and I don't think there's anything particularly complex in the logic.

Until recently it worked at the same speed on Chrome, IE and Firefox on all computers where it was tested.

However, it has suddenly started performing differently on Chrome v38 on some computers - Chrome slows the entire game to 10% of it's speed so the game becomes extremely slow to play. I can't identify any potential causes of this variation - it seems random whether Chrome plays it slow or normal on a computer. On all computers it works fine on FF and IE.

On the computers where the issue occurs, using Chrome's profiler, I can see that the issue is not CPU usage it only uses 2-3% of CPU at most) and there is normally a significant percent idle. At times Program uses 20-30% but there is still always idle CPU.

Any suggestions as to what might be causing this / how I can approach resolving it?

Answer 1

It looks like Chrome v38 has introduced at least one issue with canvas performance. If Chrome 37 continues to perform normally, I'd put it down to a Chrome bug/regression.