All teh mac fans = Sad face
(Pretty much 95% of bigger youtubers use Windows c
At a normal 75 FPS running optifine, better graphics settings, and VBO's.)
LOL I installed Optifine on my new pc before Minecraft 1.8.1 fully installed so the only thing that crashes my game is VBOs xD (Otherwise everything else was installed)
Gonna have to install Optifine again.
Also: I haven't gotten a single virus on my new PC yet. But then again I have an anti-virus software, but if you have one of those, you should be safe from pretty much all viruses.
Also I'm not sure what program you use to record, but I use
OBS
It will lag your computer a bit if you don't have a better computer.
When I record with it, I go from 60-80 fps full screen to 30 fps if the thing I'm playing on is a server that has a lot of plug-ins activating everywhere. Otherwise I can record at 45 FPS and get 45-50 fps while playing Vanilla things (Like my Footsteps, not sure about Diversity 2 since that thing is huge, and other things) <--This is without VBOs on
Also I can record at 60 fps when playing Half Life 1. Not sure about 2 yet lol (Haven't tried yet)
EDIT: Actually it doesn't seem to be only on optifine lol
On default mc vbos crashes. Gonna see why