Debugging Squeak

Hi,
I was trying to make some modifications on Squeak.
After some coding work,I found my Squeak now consumes almost 95% CPU time and more than 100M mem, and it seems like it won't slow down unless i close it. I've already saved the image and the CPU consuming problem comes out right after starting Squeak with out running any code I wrote,
my question is, is there any debugging tools that i could find out which process or chunk of code is slowing down my squeak ? I've tried MessageTally,didn't work.


Thanks~

K.Chang
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