On 19/07/16 16:42, Miquel van Smoorenburg wrote:
Known problem. Sort of a indexing thundering herd problem. Preferences -> Advanced -> Config Editor, set mail.db.idlelimit to a large number. I set it to 30000000. Fixed it for me.. Mike.
If you're using a Thunderbird version > 38 then you don't need to make this change, it is to do with reducing auto closing mail folders and opening them again (which is CPU intensive). If you are using a version > 38 then you should retain the default value to mail.db.idle_limit.
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