So I bought a new graphics card a while ago and just got the second adapter so i can play LFS on my 50" and watch movies on my 19"

Problem I am having now is the 50" is getting very low FPS 15-30fps where as if I move over to the main monitor (19") I am getting 100-200fps.

Hi Aaron

What graphics card make model?
second adaptor? do you mean plug adaptor (dongle) or second gfx card in crossfire or SLI mode?

What cable connections to each screen/gfx card?
What resolutions to each screen?

Are you changing the plugs over each time you change screens or do you have one as primary and one secondary?

any other additional info might help

It could just be down to display performance with your 50" having 3X slower latency or greater resolution, some TVs will even up/down scale the picture adding latency and degrading the picture.

SD.