So many times, People are complaining about a slow performance issue due to several reasons.
# The startup is loaded with lots of programs.
# Presence of the virus.
# Files are not organized or update required.
These are some basic reasons for slow performance. you should keep the minimum programs on the startup files.
Now run a good antivirus on your mac pc. it will clean up the mac and make your computer secure. if briefing, you may visit: [https://www.askprob.com/forums/topic/why-is-my-macbook-pro-running-so-slow/|why is my MacBook Pro running slow?]