So, I am not the most computer savvy either, but I was running into the same problem. Also, my video card was running very hot, and I found that a lot of other people were having this same issue.
To make a long story short, I found some threads that recommended turning off Bloom and enabling the Vertical Slant, and I turned all my graphics to low. This has made a world of difference for me. You can do this in Preferences > Graphics.
Hope this helps!
~Xiara