Can be wiring or amp issues. Not usually a setting. But for me if this was mine I would take the last chance to get Windows 10 on it then after activation do a clean install. If still slow I'd consider installing a SSD instead of the usual HDD. All this is mildly middle of the road work but for those that don't it's asking too much.

And with repair rates being what they are, you may want to go shopping.