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Thunderbird has started going slower and slower. Why?

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Since the weekend Thunderbird has started going slower and slower. It takes ages to recognise that I have any mails then even longer to download them. Why? I've changed nothing here. On Win7.

Since the weekend Thunderbird has started going slower and slower. It takes ages to recognise that I have any mails then even longer to download them. Why? I've changed nothing here. On Win7.

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Poster duplicated their question. My response in under the other one.