Thread:Project:Support desk/File Cache and Skins

How does the file cache work with skins? If a user using one skin visits a page, will the cache cache that version of the page... only to have to over-write it when a user with a different skin visits the same page? I ask because having recently made MobileFrontend an option for users on my Mediawki 1.24.1 installation, I found the file cache seemed to have a lot more "churn" and to not work as well as it did in the past.

I saw discussion a couple of years ago of using $wgRenderHashAppend to save caches for each skin in use, is that still a necessary/recommended step?