Hi all, I'm trying to build a video wall, and right now I'm considering the option of using a Mac Pro to power four LCD monitors with a quicktime video being played at full screen. Right now I have a Mac pro and three LCD monitors, which I've arranged on my desktop in a grid pattern, giving a resolution of 3840x2104. I've rendered a quicktime movie of a white box bouncing around the screen at 1920x1080 resolution (compressed with H.264, the file size is hardly 2MB - incredible!). When I play the file at full screen on just one of the monitors, it plays like a dream, just beautifully. But, when I go to View > Double size so that it fills all four screens, the video just lags out the whazoo. I estimate it runs at 2-4 frames per second. This is sad, because I can't quite figure out where the hiccup is. It's not the decompression - it's a 2MB file so it's not juggling billions of bytes (the fact that it plays fine at 1920x1080 prooves that it isn't the decompression) I don't anticipate that it's the specs in the computer. I should find out for sure by opening four copies of this video and playing it individually on four screens at once, but so you know what I have: Dual-core CPU I believe (I'm not positive, though) 4GB Ram 2x GeForce 7300GT (256MB ram; 10.7GB/s bandwidth; fill rate of 2.8 Billion pixels/sec each) Roughly 480GB free disk space It just seems to me like this computer shouldn't have a hard time playing this video. My theory is only that Quicktime isn't effectively using the hardware in the system (as in, no hardware acceleartion) and that it's relying on the CPU to render everything. That's a fair possibility, but I don't see why it is doing that. The hardware is there, and I'd like it if quicktime could use it. Does anyone know if there's a way to enable hardware acceleration for Quicktime videos that I've missed and may have gotten disabled by default? I looked around but saw nothing on the subject. Thanks a lot .