Hey, and thanks in advance for your help. I picked up the top end pre built 27" 5K iMac. 3.3ghz, 2Gb AMD, 2TB Fusion Drive, and also upgraded the ram to 16GB. I have been doing a bunch of work in FCPX today and it seems to run very slow. As does Compressor. Slower than my 2013 15" rMBP. When I look at the activity monitor, the CPU isn't even being used past 60%. About 35% is idle. Fans don't kick up either. IS there something up with my iMac?