Lion running slow

I recently purchased a Mac Pro and Lion came with it. I got everything tranfered over correcly, but I have a lot of lag issues.
     • files/ folders take 30-40 sec or more to rename on the desk top or on the HD
     • when trying to relink folders, they take up to 40 sec to even view
I did a line recovery and it solved the problems for about a week. Slowly but surely all the problems came back.
Do I need to do a clean install? Will Mountain Lion solve these problems? or is it as simple as flipping a switch somewhere?

I have an old MacBook Pro (17” Core 2 Duo)
Processor  2,33 Ghz Intel Core 2 Duo
Hukommelse  3 GB 667 MHz DDR2 SDRAM
Grafik  ATI Radeon X1600 256 MB
Software  Mac OS X Lion 10.7.1 (11B26)
I purchased lion from app store (with worries due to the fact that my mac is old) and it updated it successfully. The next week was a pain, safari and firefox went sloooow, fan running for no reason, whell of fortune spinning, opening folder took forever etc.
Yippicayay!
I decided to do a clean install, and now my old mac is like new again. Everything is snappy and looking good.
;o)
Just to let you know.
Regards
Jan Storgaard
Denmark

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