Hey, Im using Valve Hammer Editor quite freqently and just a few weeks ago I upgraded my computer, from a AMD quad, 9500 GT to a i7 930 with 5850 gfx card, windows 7 pro.
The problem Ive got with the new computer is that Valve Hammer Editor lags really hard, cant move the 3d window properly and the 2d windows lags even with the arrows. Not sure what to do to fix this, so I ask you guys, hope anybody has encounted this problem before. Ive already had to download a .dll file for ATI card, so 3d window works(clickable) but everything still lags quite alot. Ive got ATI drivers uptodate aswell. Cheers!