Thanks for playing! I'm not too sure what could be causing the lag, what year did that GPU come out? You could try running the game in windowed mode at a smaller resolution, and disabling things like anti-aliasing in the settings.
Lots of the mechanics and elements of the game are balanced around there being separate bars like that (determination and focus), I think it makes sense having them separate! They aren't necessarily a health bar and a dream bar :)
Let me know if the suggestions above make the game run any better, but if not I suspect the GPU may be on the lower end of what is supported!