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Thunderbird IMAP re-downloads messages

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gatsbycat2001
gatsbycat2001
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Since upgrading to Thunderbird 78.6.1 my email accounts that are IMAP are performing very poorly. In particular, every time I select a message Thunderbird re-downloads the entire message from the server. It takes many minutes for Thunderbird to start as it seems to be redownloading all messages in every IMAP account every time. This makes the larger accounts with many messages unusable. It wasn't like this before the last upgrade. Is there some setting I need to change or is this a bug introduced in the latest Thunderbird? Thanks for any guidance.

Since upgrading to Thunderbird 78.6.1 my email accounts that are IMAP are performing very poorly. In particular, every time I select a message Thunderbird re-downloads the entire message from the server. It takes many minutes for Thunderbird to start as it seems to be redownloading all messages in every IMAP account every time. This makes the larger accounts with many messages unusable. It wasn't like this before the last upgrade. Is there some setting I need to change or is this a bug introduced in the latest Thunderbird? Thanks for any guidance.

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christ1
christ1
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If not yet done, turn on synchronization for your account. https://support.mozilla.org/en-US/kb/imap-synchronization

What is your anti-virus software?