Assistance with speeding up multisite network

Hello,

I have been playing with plugins and settings over the last few days trying to get my multisite network to speed up. Most of the sites load relatively slow, around 4-5 seconds. I purchased the WPMU Dev membership in hopes to utilize the plugins and use it to aid with the loading speeds, however, this does not seem to be the case.

I was hoping there might be someone that could log in and look at my setup and perhaps tweak or provide some input on what I can do to fix this. I have support enabled in my WPMU Dev dashboard.