xcode 5, Mountain Lion: Very slow performance -

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installed mountain lion , xcode5. tried open project developed ios6. , xcode dramatically slow. ideas whats wrong him now?

edit

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it works fast new projects create. slows down when open old projects.

ok. found problem. screen attached.

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when switch 'opens in' default 5, xcode changes ui presentations ugly ios7 design , xcode starts work fast in old times. switching 4.5 brings slow performance back. thats guys!


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