too much text in textbox?

Hello, thanks for reading. I have a textbox (actually, quite a few, I am working with lots of actionscripting/manipulating text), and it seems like the more text that's in the textboxes, the slower flash processes things. I understand like if I had 2 billion characters or something, but were talking a major slowdown between a difference of 300 and 800 words. I would think that flash should be able to handle that. Some are htmlText boxes, and so this added 'hidden' html tags creates lots of slowdown as well. I have cleared variables after using them, and it has helped somewhat, but not very noticably. Does anybody have any suggestions?

Thanks kindly!

It's probably your coding - post your codes or provide FLA :)