Slowdowns and .CR2 files

Hi,
since when i upgraded my MacBook Pro 13 from Lion to Mountain Lion i'm experiencing a very hard slowdown in showing me the folder content's, especially if the folder contain .CR2 files(canon raw). Also, if i try to move some .CR2 files to the trash, it takes a very long time, even for a single file.
No issue to visualizing the same files with quicklook.
Can anyone suggest me a solution? My workflow is badly compromised by that problem.
Thanks,
Luca

Hi again,
after the upgrade to 10.8.2 the problem is still there. Now i'm thinking to reinstall the OS. For the first time in my Mac experience(since system 9).
Thanks,
Luca

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