I've been having that same lag recently, running Fresh1.1 with the old taskbar and clear lockscreen. I don't think this lag has anything to do with large threads, as my largest thread is only like 250 messages. Might just be a slight glitch in the most recent update. Reboot your phone, it helped slightly for me.
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If at first you don't succeed, get a bigger hammer
Running whatever release of Froyo I happen to be on at the time 
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