When I took these snaps I had around 300 back online again, average is around 400 online. Even that 100 extra isn't going to make much of a difference, as the load barely moved from when users began coming online to the end of 30 minutes of it being open with 300 already back on.
What I knew before I changed? That my server costs would be much, much lower. If I kept going with VB4 I had to upgrade again to a dedicated vs. a hybrid solution. I changed over to a more resources recently, and VB4 pretty much sucked up everything immediately, as it was extremely slow on the ServInt Ultimate VPS... so instead of upgrading further, I knew the change would seriously reduce the load... and my expectations weren't wrong.
Proof is in the pudding! An XF endorsement for savings if I could ever give one... Server costs!
The mysql change just blew me away... again, I expected it, and XF didn't let me down.
Now fully converted all my own sites to XF and couldn't be happier!