Why I should stop using TweetDeck

I like TweetDeck, but its memory usage is bringing my machine to its knees:

Using 300MB to read a few 140 character long Twitter messages, that is just silly. To put those 300MB in perspective to what the processes normally use on a WinXP machine:

Is this a memory leak in TweetDeck, or is there a general problem with the Adobe AIR platform? What would you suggest to use instead of TweetDeck? Twhirl?

(Chart generated by chartapi.org)