3d editor

[unknownx9 10]

Hello,

I am creating a mission in 3d editor and recently the mission editing became very slow to respond, especially if I switch to 2d. The mission becomes so slow that even the cursor would take a while to move. When I am in 3d it is better in moving around, but when I select an item it freezes for about a 3-4 seconds and then responds but also moves that object even though I did not move it, even deleting an object has a freeze before the object is deleted. Everything else on my computer runs fast except for this editing.

Computer has Intel core 2 Extreme (quad core), and 8 Gigs of memory, video card is also Nvidia GTX 260 55nm. I have over 200 Gigs of free space on my hard drive. I am running a 64-bit windows vista home premium.

Some help would be greatly appreciated,

Thanks.