You should describe your problem more. What exactly has become slow?

With enough RAM (8 GB are my standard for an end user machine) you
could tweak caching a bit:
Activate Readyboost on your SSD (maximum 32 GB):
https://en.wikipedia.org/wiki/ReadyBoost

Play around with Primocache:
https://www.romexsoftware.com/en-us/primo-cache/

Regards

M.