Has anyone else noticed that the Google Ads take a lot longer to appear than the rest of the page? I worry that sometimes my visitors won't even see the ads, because they take a few seconds to appear and the visitor may click away before then.
I wouldn't worry about it too much. There are several things that can slow it down and I doubt that it is Google. Remember that the call to them is an iframe which means it can be either your server or the connection from your server. Plus it can depend on the browser since java comes into play. If the jvm used to view your page is being slowed down (for whatever reason) then the non java data can show faster.