Top 5 Questions: 1) Is making my Mac run harder for certain programs...LightRoom,Photoshop,Final Cut Pro & even Preview. Is yours? 2) I see & feel no difference in performance...Why did I update? 3) Have you upgrade to OS X Mavericks? 4) Why did you upgrade? 5) Thanks? <<<Not really a question Or yea one more thing..There's a bug in FINDER! Can't really explain what it is but every time I remove something to trash or to another folder. It still shows it being there until I close the FINDER & reopen it. My Story: I use my Mac a lot for Photography & Edits in Photoshop..Heavy in FCP too! For some reason when opening RAW files..Let me just say, LAG is not it's best suite for this Mac! Before it use to open right up..Multi able images too, I use to be able to Open up 20-30 files in one shot and my Mac use to open them and load them up in a split of a second. And don't get me started on Photoshop! When using Photoshop "Heavy" my processor would never climb to a degree in which I would have to manually adjust my fans. Seems to me, I have to do this now with the "New Maverick" I say...It feels like Maverick is making my Mac run harder then before & I don't like it. Is there any solution to fixing the LAG when viewing a RAW image when opening it with Preview? Which I do use it often...sometimes you want to take a look at the image before Importing it to Lightroom. you feel me Cuzzz? Thanks! P.S I think I might go back to OS X Mountain Lion.