> Back to slow compiling again, don't know what's going on here. It usually starts off > at 100% CPU use but then gets less & less use.
That sounds like your CPU's generating more heat than the fan can throw off so it's downclocked itself to 1.8 GHz or less. From the part numbers I'm assuming it's a laptop - try shooting compressed air into all the vents to make sure they're breathing freely.