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Thunderbird uses 50% of CPU ressource

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Hi, Imac 24", OS10.8, Thunderbird 31.6. I have 3 mail boxes, 1 IMAP and 2 POP Mail boxes are synchronize every 10 minutes. Asking nothing to Thunderbird locally, it uses 50% of CPU. This problem appeared recently. Can you help me to fix it?

Hi, Imac 24", OS10.8, Thunderbird 31.6. I have 3 mail boxes, 1 IMAP and 2 POP Mail boxes are synchronize every 10 minutes. Asking nothing to Thunderbird locally, it uses 50% of CPU. This problem appeared recently. Can you help me to fix it?

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do you have an anti virus program. That is the common cause under windows.

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do you have an anti virus program. That is the common cause under windows.

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Yes. The problem is solved now, the thunderbird folder was too big.

Thanks for your answer.