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Do you have proper drivers for your video card on Ubuntu ?

On my MacBook Air runs smooth on both Chrome and Firefox. Same on Windows 8.1. Unfortunately, I can't test it on Ubuntu because I don't have a GUI installation of Ubuntu (I use the server version).

Runs smoothly on FF on my Macbook (Retina). You likely have a driver issue.

I ran it on Ubuntu 14.04, Google Chrome, nVidia card, it ran great! The CPU usage was a lot lower than I expected for JavaScript doing WebGL.

Butter-smooth on latest Chrome for Mac OS X

does this work? http://get.webgl.org/

what does about://gpu say in Chrome? There are bugs in the latest version of Chrome for Ubuntu in both the Intel and nVidia drivers.