This has been on on-going thing for quite some time.

This has been on on-going thing for quite some time. I thought my hosting was on-par, it's a VPS, and I have upgraded it significantly.

The website does see a lot of traffic, but I need some ideas on ways to speed up the website. This thing feels like it crawls. Some of the other sites on the same VPS seems to run much faster.

Could someone please help me. Perhaps to optimize the WHM (cPanel; vps), optimize the SQL tables (outside of the standard phpmyadmin or WP default Optimization), Cache plugin's, etc.

Thanks in advance!