[MlMt] Suddenly, lag in address-completion?

[Seebs]

So, I've been using mailmate for ages, works pretty well. Just today, I 
started having a new experience. I start typing an address in the To 
bar, and there's a very noticeable pause, maybe two or three seconds, 
before the autocomplete list shows up.

Do I have too much email or something? Do I need to segregate older 
messages out, perhaps? Is this a tweakable or tunable thing that I could 
address by hinting that I have plenty of memory?

-s