Hi everyone. I've been on OSX for a couple of years but i still think in Windows terms, so apologies in advance if this seems newbie-ish. I have a early 2012 MBP and I went from Lion to ML to Mavericks over the past 18 months. I've noticed I'm getting a lot more beach-ball notifications and the machine just seems sluggish. It only has 4Gb of memory but I don't really tax the system - mainly for surfing and some iPhoto. I'm wondering if I should wipe the system and reinstall Mavericks clean (have a bootable USB device for this). Does that seem a reasonable thing to do? I know OS X is better at handling it's stuff than Windows but I don't know about things like temp files etc, anything that's been left over from the previous OS's that have been on there. There's 350Gb free on the drive so I know it's not a disc space issue. Is there something I can do that may help, without doing a complete reinstall? Any help or tips appreciated!!! Phil.