robster124 - 3:30 pm on Aug 9, 2013 (gmt 0)
Over the last 2 years one of my sites has seen a large shift to mobile traffic away from desktop. Something that hasn't surprised me as its a business information site which attracts a lot of "local" traffic which means mobile these days.
Unfortunately this mobile traffic the CTR is dreadful from these devices, only a third of where tablets and desktop stand (tablet performs best, just slightly over desktop). CPC is exactly the same (which perhaps suggests adsense ads don't change with platform - a different topic perhaps).
Intuitively it makes sense, mobiles are more fiddly and people feel less comfortable surfing away from the core topic for a long period of time. I'm not entirely sure there is a solution for this. My page load times are instant (all dynamic pages are cached so its just file system load time) and I have 728x90s right at the top of each page.