MacBook became very slow after Lion

[yvrgal]

Will this erase any stuff on the mac? Like documents, pictures and stuff?
Thx <3

No it won't.

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This worked for me. It took about a hour for me just to get to the point of doing this because of the extreme lag from Lion but after the repair it worked like it did from day one with my Mac. Thanks a bunch yvrgal!!!!

You're welcome, Boodie.

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Awesome, I tried a lot of things to increase the green in my activity monitor and speed up my Mac after the upgrade to Lion, none of which made any difference until I ran the Repair Disk Permissions in the System Preferences. Just took about 5 to 10 minutes. Deleting and organizing files didn't make any difference.

Glad it worked out for you.