choppy mouse in webGL build

Hello,

I don't know why, but when I try to compile with webGL the mouse control feels commpletly choppy/jerky. I use the standard mouse look script from Unity 4: http://pastebin.com/VKRyTUBq

But when I compile a webplayer plugin version, it works just fine.

Here's for comparaison:

WebGL build : http://hijackedbrain.com/slice

WebPlayer build : http://wip.hijackedbrain.com/slice

Any help would be appreciated. Thanks for reading.