Just noticed today that my FPS drop when typing. Was chatting w/ squaddies, and fps went from 29 to 22. When I hit enter and sent msg jumped back to 29. Did this many times to check, and indeed happened everytime. Logged in just now and I noticed it again. I'm fairly sure it ALWAYS happens, I just noticed the 7fps drop today though. Happened every time I tested it.
Sad part is I took off, and 1/2 my flight was a solid 55-60 fps (capped to 60) but last 1/2 was solid 30. I WISH I knew why fps dropped. Had no nme's around me both 1/2's (we had killed them all) and it's bizarre.