I forgot about laptops . Yeah laptops have the tendency to heat up. This is a product of having portability which comes at a cost. I would consider buying a home, stationary computer and add some more advanced graphic and memory chips in the free slots.
In other words, you should invest ~$500+ into a new mid-line PC, buy a monitor, keyboard, and mouse (assuming you have a dedicated desk already) so you can play games from over 10 years ago a little faster. This is a fantastic idea!
Onto the question itself, I think it'd be good to know what
you did to "hinder" the rom to make your PC heat up less. Could you let us know what settings you changed? It might be that one of those settings is related to some sync issue, which is cutting your "speed up" button.