I've been disappointed in AdSense performance, and I've been paying close attention to the third party ad networks as well as attempting to fine tune the various general categories of ads that appear on my site.
I'm confused as to why the percentages don't add up when digging deeper within a general category. For instance, if you take Category A, which shows 5% of ad impressions, yet only 0.5% of income, that's an area to investigate. When you click on Category A, it may have 2 or 3 more specific categories listed within, but none of the ad impression percentages even come close to the 5% reported, nor does the percentage of income generated match what was reported in the overall category.
Is there a major delay in reporting this information, or do I just not understand what I'm looking at?