It seems to me that, occasionally my adsense ads will appear very delayed..... Especially my Leaderboard ad on top. It seems that my other 2 ads appear fine, except for this one really? Would you happen to know what is going on? because its pretty much going to be useless to keep that ad.. since people have scrolled down before it even appears. Please help! Here is an example http://www.numeroten.com/blog/teen-gourmet/files/bacon-wrapped-meatloaf.html
Could be because of the flash ad or downloading the image of the ad. It's no big deal, let adsense do its job, and track stats with custom channels, so you'll see how much your CTR is for this leaderboard.
If you put lot of widgets , your site performance will be slowdown. May be some times , you have opened your site on the slower connection system. Now everything is fine with your website. It is opening fine and all your ads are working fine at one time.
It is also happening with me. Ads at top (336*280) is displaying very late and thus getting less ctr.