I recently upgraded the HDD in my MacBook Pro Mid 2010 to a 250GB SSD (Crucial). I installed Yosemite as new, and installed and activated Trim Enabler (Cindori). Trim Support shows as "Yes" under the System Report, and the negotiated link speed is 3 Gigabit. Since this time, I have noticed that after a number of days usage, individual applications will become sluggish and will beachball at upon each click request. When this happens, usually other applications will work without problems if I were to switch to them. Booting into Single User mode and running "fsck -ffy" seems to resolve the problem, though I seem to have to run that command more than once in order to see the problem resolve. (i.e. if I ran the command once and exited/booted, the application that had been beachballing would continue to do so until I ran the command a further few times.) If there are any comments, they would be welcome, thanks.