lempkee, if you have WBCtrl installed then you can include this line in your startup-sequence, just before C:LoadWB:
C:WBCtrl IMT=ICONFAST
Then change C:LoadWB to C:LoadWB SIMPLEGELS. If using AGA, you can also use FBlit. I think that this makes Birdie use Fast Mem instead of Chip Mem. It seems to be working for me at the moment, i have 128meg fast mem! :-)