PageSpeed: Make landing page redirects cacheable (deprecated)
Overview
Many pages, especially mobile pages, redirect users to a different URL, for instance from www.example.com to m.example.com. Making this redirect cacheable by the user's browser can speed up page load times for repeat visitors to a site.
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Details from Google
While the best practice with redirects is to remove them wherever possible, it can sometimes be difficult to eliminate landing page redirects, especially redirects to mobile-specific sites. For instance, the mobile version of a site may be served from a different web server, which can require redirecting to a different hostname. In these cases, it's important to make the redirect to the mobile-specific site cacheable, to reduce page load times for repeat visitors. If the mobile version of your web site is served from the same web server as the desktop version of your site, you should instead eliminate mobile-specific redirects and serve from the same URL as your desktop page.