Facebook has repeatedly found that people don't stick around for pages that take too long to display -- 40% click away if a page takes three seconds to load, according to Facebook. On Wednesday, to speed up the process, Facebook said it was introducing new technology that "pre-fetches" the contents of an advertiser's mobile website, meaning it stores its contents in Facebook servers for faster access when a consumer clicks on the ad. Facebook could even prevent ads from showing to someone if the website it leads to is too slow and not optimized for mobile, said Matthew Idema, Facebook's director of ad products marketing. Get the full story at AdvertisingAge