Enable Caching "USER" instead of "USER_INT"
Felogin is a extension which is used often in the right column of every page. Because the extension is not cached, this leads to performance losses, and the whole static file cache doesn't work anymore.
There are two solutions:
1.) TypoScript condition which checks for [usergroup = *] and sets the extension to USER_INT if there is a user logged in. (Extension has to be set to USER as default)
2.) TYPO3 Core support for 'condition based caching' or something similar.
(issue imported from #M9599)