I don’t think GPUs make too much of a performance difference with a ARPG like Diablo 3.
I never accused you of cheating. English may not be your native language and I suspect you think that I had accused you of cheating in my original reply. I have not.
I would prefer not to have health issues, but it is a part of getting older. Even for younger players, mouse/keyboard is much worse than a controller in terms of ergonomics.