App engine css not updating
The four ways of going mobile (responsive, dynamic, AMP and separate urls) each have their own way of letting Google know that your site is mobile.When your site uses responsive design, Google can understand it without any hints or extra code.
Mobile optimizations for the purposes of this article refer to optimizations for users, search engines and avoiding search engine penalties.
The desktop page with the above rel=alternate code tells Google that that if the screen is less than 640 px it should refer to the alternate mobile page.
The mobile page with the above rel=canonical code lets Google know that the page is a version of the desktop page listed.
The mobile seo tool at the top of this page will let you know if you have page speed problems on your pages.
Learn how each of the three mobile methods affect speed.
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A slow website will make an even slower mobile website.