WPMU DEV Prosite is making my Site Very Slow!

Hi,

Hope you are having a great day.

I searched the forum but I couldn't find what I was looking for. I'm creating a membership website with ability to create a website for each member.

Everything was going fine until I installed and activated WPMU DEV Prosite Plugin and then the website has become so slow that is really frustrating.

When I deactivate the Prosite Plugin the speed goes back to normal and when I reactivate it, The website becomes slow again.

I also have a dedicated server for the site.

I would really appreciate it if you could tell me what I can do to fix this.
Eagerly waiting for a response