We get asked all of the time about fixing a Mac Book Pro which gets hot while using it. In some circumstances, its a faulty hard drive or an old fan not spinning correctly and we can swap them out for a super fast Solid State Drive (SSD)
However, there is also the issue that has been around forever; your Mac Book Pro loses most of its heat through the aluminum body and the fans kick in way too long and way too low, this is why your Mac is so slow.
The fix is to install this lovely free bit of software from this link.
I have created a video of my settings to help you out.
Hope it helps
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