I upgraded my MACPRO quad 2009 with 10.11 yesterday. Running CS6 everything. With PPro, it has a serious “cursor” lag. When I drag or move an object or scrub I have to literally stop my position and wait a full second for it to catch up. Video Playback is choppy at best. Even if I make the video composite video frame small it still stutters. But, I noticed even QT plays choppy. AND movements on the desktop are not smooth. I’m running both a GeForce GT 120 and an Radeon HD 5770 BTW. I upgraded now because I just finished a big job and taking a break. May have to roll back my OS.