Hard drive partition advice

I just used bootcamp last night to install 64 bit windows 7 for video gaming use, and before I did I read a lot about everything I needed to know including how big to make the partition which seemed most people agreed 80-100gb so i did 80, but now that I'm actually enjoying the performance I'm wondering if I should have done more bc after installing crysis 2 i have like 30 gb left. Is it ok to use up say 90 95 % of the partition or will it start slowing down and affecting performance, or should I just transfer my save file and redo the installation with more space? Thanks in advance.

how big is the drive in question?

OSX needs room to expand, so does Windows.

If you decide your Windows partition is too small, you can non-destructively resize it with Paragon Software's CampTune. $19.95 LINK

It's the base model so 500 gb, but since I have so many computers currently this one is pretty much a work computer, I use it for writing music and playing games so my osx partition had 300 gb before i did the bootcamp. All my movies and stuff are on other computers so I doubt it will expand a whole lot, it's been at 300gb for awhile.