What graphics mode on a mac should i use to get less lag?

So opengl or metal helps boost fps?

OpenGL probably decreases FPS. Metal can most likely help with FPS.

You should replace the parts. I think a new graphics card could work

As a former MacBook user, use the minium graphics if you are more focussed on FPS.

There is no notable difference (appearance-wise) in most graphic levels below 5 unless you account for render distance.

Use Metal. It’s the graphics API built by Apple for Mac and it will have the best performance.

Should I also disable frame rate manager with it?