Guild Wars 2

So I’m running gw2 on a MacBook Pro -

Processor - 2.4 GHz Intel Core i7
Mem - 4gb 1333 Mhz DDR3
Graphics - Radeon HD 6770 1024
on Lion

I run on minimum settings and can get up to 70 fps.
The problem is that when I run gw2 and check the system processes, it runs at around 280% which means that the laptop gets hot as hell and lags the game more and more.
Is there a fix for this or is it normal to be getting this much crazy usage?

This needs to be fixed, still tries to do it even if I have auto attack turned off.