Should I Upgrade My Ram?

Well I try and record Minecraft and it goes to 15fps from around 80 - 200.
Also, my video card is good enough so I wouldn't need to upgrade that.

I do have 60 fps when recording Minecraft

that's why I wanna upgrade my Ram, I think that's the issue.

What's your system specs?

You got 8GB DDR3, tht's probably why you don't lag.

I have "4GB" And i havent tryed recording, Minecraft, but i can record warrock on 30fps and i dont lagg... But i have Radeon HD 5450 graphics card..

What could I do to help me not lag whilst I record? I can record Mw2 without lagging aswell.