It's been 15 days since I upgraded my web host from a VPS to a private server (within the same company).
In the day after the upgrade my adsense CTR dropped by half and my CPC increased by about 70%.
Nothing was changed on the website.
What could have caused this CTR drop?
[edited by: rlopes at 9:16 pm (utc) on Nov 1, 2012]