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Switched ad size -- RPM dropped.

Is this normal?



11:44 pm on Dec 15, 2013 (gmt 0)

I went from vertical ads to the 336x280 ads.

A few sites still had old square ad units but they were mostly inactive. Others I had to create new ad units.

Should I expect that it might take a few weeks for everything to smooth out?

There's been a definite drop in CTR and RPM since I did this a few days ago.

Google acts like the 336x280 is the best ad. And for my sites, it definitely fits better than the vertical ads.

But I have to admit, the vertical ads always seem to perform well.

I'm worried. I hope it's just a case of Adsense adjusting.

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