can help MODS

HELLO;
I wonder if a mod can help with this little problem.
with fps. I have to switch windows to have normal fps.
Here is a demo video, and thank you very much if I can help.

http://www.youtube.com/watch?v=fZWW9yrD0d4&feature=youtu.be

SPECIFICATIONS OF MY PC

http://www.youtube.com/watch?v=i8Tn33RUV7g&feature=youtu.be