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Thread: Does switching the loading order of Ads influence income?

This discussion is about "Does switching the loading order of Ads influence income?" in the "Advanced AdSense Publishers" Forum.
Hello Google officially said in the AdSense Blog: As you might already know, a great way to increase your AdSense earnings is to place ((login ...

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    Idee Does switching the loading order of Ads influence income?

    Hello

    Google officially said in the AdSense Blog:

    As you might already know, a great way to increase your AdSense earnings is to place ((login for URL)) on webpages that are rich with content. Here's a way to maximize your revenue with multiple ad units: Make sure the ad unit with the highest CTR is the first ad unit in the HTML code of your page. We've heard that there may be some confusion on this, so here's some clarification on how we serve ads to a page once we know which ads win the auction.

    Currently, the first ad unit on a page always shows the top ads that win the ad auction. Also, if there aren't enough ads in our ad inventory to fill all of the ad units on a page, the first ad unit on the page will display ads first. This is why I recommend using ((login for URL)) to determine which of your ad units has the highest CTR, and then placing that ad unit first in the HTML code.

    For the purposes of this post, the ((login for URL)) on the page is defined as the first instance of the ad code within the HTML of the page. Keep in mind that the first ad unit in the source code is not always the first ad unit that your users will see when the page finishes loading in their browser. For example, if you use DIV tags, our system may recognize an ad unit which users see at the bottom of the page as the first ad unit.

    Now that you know how to make the most out of multiple ad units, try this tip and watch your earnings grow.
    Source: ((login for URL))

    I put this to a test again for 4 full days.

    On my medical forum I have a large rectangle that is loaded first and a medium rectangle that is loaded second. The medium rectangle, even though it is loaded second, has a much higher eCPM (near double) then the large rectangle that is loaded first. It also has a higher CTR. Both Ad Units are tracked by different channels.

    That is why I made the experiment and put the old "put the best performing Ad first in your source code" to the test.

    And the result is: No change in revenue whatsoever

    But why is that?

    I am not that sure.
    One reason could be that AdSense is able to track down performance to an Ad Unit level and serve the highest paying Ads to the best performing Ad Unit independent of its loading order.

    One reason could be that the 2 Ads I made the test with are different size and because of different ad auction competition (the medium rectangle eCPM is much higher even though it is loaded 2nd because there is more competition for this ad unit) the loading order only has influence on Ads of the same size.

    What is your opinion about this?

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    I have tried that myself awhile ago and I didn't notice any difference. So are you saying the medium rectangle (I believe it is 280x250?) converts better for you than the 336x280? Are you saying there is more competition or ad inventory for the 280x250? I only use leaderboard and the largest rectangle.

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    Yes, for me it is the case. The medium rectangle 300x250px performs much better then the large rectangle. I have image & text ads activated and made the channel(s) available for placement targeting.

    My theory is that because of a medium rectangle being a standard ad size the competition is much higher when it comes to image ads. Text ads fit in every ad size so image ads are making the difference in my opinion.

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