I got a vps with Host to host some high traffic adsense blogs. Everything was going fine (ctr ~6%). Moved over a few other high traffic blogs from other hosts to this one, which was fine too in the beginning (ctr ~6%). The sites started taking forever to load at times so I contacted Host to see what the issue was. They said its because I had too much traffic and to upgrade packages. So I did. After the upgrade, there were some minor issues that required the host to go into server to fix. Ever since these "fixes", my CTR has dropped from 6% to 1.5-2.5%. Traffic remained the same. I wanted to know if it was a fluke or if there was something fishy going on, so I transferred one of my sites to another hosting account. That site is now back at 6% CTR. I moved over a second site to see if that would improve also and that one is now back to 6% also. All sites that are left on first server are still 1.5-2.5%. How do I diagnose this problem? I have a few big sites on Host 1 so don't really want to move from it unless theres no other options.. Any help is appreciated!