Would one of you kind souls help me understand the relationship, (or lack of) between Photoshop, RAM, and pstemp files. System: P4 1.5 gig, 512 PC800 Rambus, w2k. Im working on a 500meg file that has been very slow going with 512meg of ram. The temp file runs about 2 gig. I run out and get another 512 ram and think Im going to see drastic improvement. I dont see any. But here is the kicker... Photoshop officially will ask for up to 5 times file size in memory. If you dont have it, it goes to the disk with a temp file to make up the difference. I open photoshop with 1gig of ram, NO file, and it puts a 48meg temp file on disk. HUH? Can someone make some sense of this. Thanks in advance. Pinto