Anyone experiencing slow SSD write speeds with a Samsung 840 Pro? Before I upgraded from Mavericks, I used to get 500 MB/s write speeds, now I'm getting less than 90 MB/s speeds. I've tried solutions from the following website: http://www.macissues.com/2014/10/25/how-to-speed-up-a-slow-yosemite-upgrade/ Nothing helped. I haven't tried a fresh install, but I'm trying to avoid it. Any suggestions greatly appreciated.