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I am having some big issues with Mail.app 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
    Commented Aug 2, 2011 at 2:56
  • Give it some time to optimize performance. Commented Aug 2, 2011 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 :) Commented Aug 2, 2011 at 9:02
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    @Randolph West Thank you! Rebuilding the database did the trick. It's running fine now.
    – Fernando
    Commented Aug 3, 2011 at 1:54
  • Glad I could help.
    – user479
    Commented Aug 3, 2011 at 4:23

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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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