I take it you are referring to Thunderbird, the Mozilla mail client?
I get such lags as well, in a number of things and sometimes, especially
if I have a large (>1000) number of messages in a directory it can all
but freeze up. I use it on an apple, by the way, it's not a debian
issue. I imagine that there's a Firebird specific mailing list but I
don't know. I've only just joined the Mozilla mailing lists.
Regards, Max
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