macbook pro

Sorry, but you cannot upgrade a laptop computer. If you need more speed then sell yours and buy a faster, newer model. If you had something different in mind, then consider saying more precisely.

Please describe what is now "slow".

Run this and post the results here so we know more about your configuration.

EtreCheck

This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

What is the EXACT model/year MBP that you have?

Ciao.