Hi, even though I have deleted the partition and re-installed the OS X Lion (the original OS), I still have problem with performance with my Macbook Pro. My Macbook Pro is a Intel Core i5 and there are 8GB RAM, and 300GB HDD. I also have repaired the permissions. It is very slow to open software, web browser, etc...but it is Ok to surf at Web, so I consider that the internet band is ok. if you check at the monitor, the entire memory is not used, the cpu usage is not so high,...and the HDD is not full, there are about 20GB used (there are 300GB). Does anyone know how to improve the performance? or, at least, if there is any software that it is possible to tune up the performance? tks.