System Resources

I have A LOT of duplicates in my iTunes I think it's up to 1200 they should really make a fast way to clear duplicates. So I did the display duplicates and am doing the tedious task of going through my library deleting them all individually and i notice the further i go the slower my computer gets. So I open up the task manager. iTunes.exe has jumped from 49K memory to over 900,000K <--- I can't stress enough that this is not an exaggeration. Someone should probably look into that