"Third-party scripts are probably the #1 cause of poor performance and bad UX on the web. It's no wonder things like AMP exist. The fact that it disallows third-party scripts is probably the largest contributor to it making sites fast. Controversial as hell, though, in its other choices."

"Instead of search results being generated favoring the desktop version of a site, Google will begin to favor mobile versions. If you have a half-hearted mobile site and a full-fledged desktop site, you better be careful once Google starts favoring the mobile site."