Extremely slow Wordpress dashboard, any ideas?

For some reason one of our websites has an extremely slow backend. The dashboard is going extremely slow, from page to page to page. Sometimes it takes for up to a minute to access different pages.

I ran some testing on the VPS, and it appears that everything is running fine and the server is no where near capacity nor does it spike that high.

Any suggestions or optimizations to make the WP dashboard run any faster?

Thanks in advance!