New answers tagged imap
You can use a browser plugin (with GreaseMonley) to fetch pop3 email every 8 minutes. See http://www.danielslaughter.com/projects/gmail-pop3-checker-for-greasemonkey/#install
Without more details, I think that the best option is to do the bulk operations in http://mail.google.com just before you could left alone your Thunderbird instance for several hours, as the sync process could take "a while" and consume "a lot" of resources of your computer. References How actions sync in IMAP - Gmail Help Deleting IMAP messages - Gmail ...
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