I moved to a new host about two weeks ago. I moved to a new SSD drive that improved speed 40%, reduced page load times 38%, and dropped response times in half.
I verified this with 5 different third-party speed testers and within Google Analytics itself.
Before the moved, I have had a constant 4 out of 4 rating for site health in Adsense scorecard since the scorecard was released. Now about a week after the migration, I'm down to a 3 out 4.
I have changed not content to my site since the migration and we are talking straight html and images loading. There are no databases involved.
What would you guys make of this?