Comment 127 for bug 704623

(In reply to Miroslav Suchý from comment #82)
> This is still valid in Fedora 22.
> And I increased the bounty for this bug resolving to $150.
>
> https://www.bountysource.com/issues/3558744-imap-temporary-100-cpu-and-
> freezes-with-thunderbird-3

Very generous Miroslav. I hope this helps get a fix. I'd like to offer some suggestions to increase your odds of success:

#1 you should mention this in an appropriate bug at bugzilla.mozilla.org where it will get many more eyes.

#2 if you don't find an appropriate bug at bugzilla.mozilla.org - meaning one that matches your issue precisely - then you should create one

the key to finding a precise matching bug, if one exists, is narrowing the list of symptoms, and determining whether the list of symptoms is just one item, or a combination. Note - suggest you disable automatic compact first anything, in tools | options | advanced | network and disk. To name some possibilities:
- high memory (over 500mb, if so how much)
- high cpu
- global index off or on
- autosync (syncrhonize messages) off or on
- IDLE enabled or not (account settings, server settings, advanced)
- situational:
 * only during startup
 * only when manually or automatically getting new messages
 * only when clicking a folder

The list of candidates bugs for the most part have pretty well narrowed summary titles - https://bugzilla.mozilla.org/buglist.cgi?bug_id=%20383718%20&bug_id_type=nowords&keywords=perf%2C&f1=short_desc&keywords_type=allwords&o3=anywordssubstr&list_id=12308919&bug_severity=blocker&bug_severity=critical&bug_severity=major&o1=nowordssubstr&resolution=---&classification=Client%20Software&classification=Components&query_format=advanced&f3=short_desc&f2=OP&component=Backend&component=Database&component=Folder%20and%20Message%20Lists&component=General&component=Networking&component=Networking%A%20IMAP&product=MailNews%20Core&product=Thunderbird