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In a recent post [webmasterworld.com] I asked for Adsense Optimization advice.
Unfortunately, after making some of the adviced adjustments to the content structure of my page to enable better ad targeting, I discovered that Adsense is still serving ads targetted at the previously downloaded version of the pages on my site.
How can I get the Adsense bot to download and use the new version of the pages on my site in selecting ads to show?
But it can take time for Adsense to get the taretting right. Giving it a few days wouldn't hurt.
After a few days, do the reverse to get back to your original URL. Or just leave it as is. I've done this myself on my sites to re-target the ads.
I’m glad to hear you were able to incorporate some of the suggestions made on [webmasterworld.com ] for optimizing your site.
To add to those ideas, I recommend including more text-based content on the specific subjects which you would like to see advertised on your forum. Complete sentences and paragraphs are especially helpful to our crawlers in determining the meaning of a page and serving relevant ads.
Also, as everyone above mentioned, the crawl delay you have noticed is normal. Crawling is done automatically by the AdSense bots, and cannot be triggered manually. As we usually tell publishers, when you make changes to a page you may notice it can take 1-2 weeks for your ads to adjust to the new content.