|Try updating your graphics driver.|
Try reducing the programs that start with Windows to unload resources.
Do a disk clean up.
Run Malwarebytes (just to be sure).
The patch may be better overall, but may demand more on the GPU in ways more suitable to newer cards, if all else fails, lower the settings a bit or upgrade to a newer graphics card.
You have to be a little bit crazy to keep you from going insane.