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Thunderbird slow to respond to delete command

I am running TBIRD 17 on a dell xps 17 2.20ghz with 8GB ram and win 7 pro 64 bit. 2 days ago, thunderbird suddenly started lagging really bad on executing the delete command.I would select an email, hit delete, and it would take 4-5 seconds to respond. No other commands seem to be affected. I tried selecting a block of emails and deleting them all at once and dleleting them one by one - it made no difference. Any ideas?
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