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I am having some big issues with after upgrade to Lion. Performance is horrible.

When i open a message, cpu usage grows up to 150% See monitor activity screenshot

I already tried to repair permissions and remove all accounts to recreate it but it didn't make any difference.

I'm using 2 accounts with imap. The total messages on inbox is 12.000. Before upgrade, it was running fine.

Anyone experiencing this? Any ideas of what should i do?

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This is curious. Have you tried rebuilding the database? I have almost 60 000 items in my mailbox. – user479 Aug 2 '11 at 2:56
Give it some time to optimize performance. – Paul Eccles Aug 2 '11 at 7:11
Have patience, the Lion's Mail has to upgrade the Mail database and it 12k items (and no knowledge of your hardware) that could take a while. Plus, Spotlight wants to upgrade too, the LaunchDB will want to upgrade, everybody wants to upgrade at the same time :) – Martín Marconcini Aug 2 '11 at 9:02
@Randolph West Thank you! Rebuilding the database did the trick. It's running fine now. – Fernando Aug 3 '11 at 1:54
Glad I could help. – user479 Aug 3 '11 at 4:23

If you open the Mail's Activity window (keyboard shortcut: Command+0), what does it show that justifies the 150% CPU figure?

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