Hi, I clean installed M.Lion and as expected, after some time, my machine has begun getting sluggish and no more as snappy as it used to be. My question is : Do I need to use Maintenance Applications such as OnyX and use it regularly or would I need to simply allow Macbook Pro to run its (fragmentation and cache cleaning, permissions repair) proprietary maintenance as it is meant for. I don't intend to upgrade any hardware at all : I have 4Gb RAM but no Solid State drive. I want to get the best out of my current configuration (2.26 GHz Intel Core 2 Duo - Macbook Pro 13"). Thank you.