FCPX has become almost unusable. It takes 15-20 minutes sometimes to launch and 10 minutes to navigate between projects. I get a beach ball for a minute at a time sometimes between making edits. I need some help determining what the bottleneck is and figure out how to fix it. My company has 78 videos, between 25-40 minutes each in length. We make edits to them fairly frequently. Most of the video is SD but we're replacing it with HD as we can. I've been rebuilding them in FCPX, and am about 80% done. As far as I can tell, the problem could be: - The files are stored on a Drobo, about 85% full, connected via USB2. As soon as somebody releases an eSATA/Thunderbolt adapter I'm going to get it. - The project files are in HD. This means that I'm winding up having to re-render the SD video as I drag it into the timeline and scale it to match the 16:9 ratio. - I'm using original media, not proxy media. I was thinking that it'd be fruitless to have extra proxy media laying around, but as it stands I've got 2.4TB in render files. Any advice would be very, very appreciated. Edited to add: I'm working on a <6 month old 27" 3.1GHz i5 iMac with 16GB RAM.