Slow down question

My program has begun to get slower, just by running. It drops from 60fps to around 40 fps in 50 seconds of running. I cant think of any serious operations i've added to it, and I cant place exactly when this slowdown happened. One thing I did, was switch what was a 400 item array over to a TList, which gets this done to it alot (but not more than the array did)

for i:foodpellet = eachIn foodlist
'stuff
next


any ideas as to whether that slows me down, or what else might be causing a fairly consistent slowdown over time? foodlist is staying about the same size as I run, but for some reason, the longer it runs the slower it gets.

Are you calling FLUSHMEM before you flip in your main game loop?

no
what is the call to make? just flushmem()? And what does it do? (sorry, i have no training in programming beyond a highschool class 2 years ago, this is probably obvious)

Edit - Done, thanks, fixed everything! I was afraid it was gonna be something like "Tlists ruin everything" and then I would have to rewrite like 200 lines. Such a simple solution, thanks alot.