Static File Cache for TYPO3. Very flexible and very, very, very fast ;)
You have to install the extension in composer mode. If your TYPO3 installation is not in composer mode, you should change that (!!) or you could also copy-paste the extension manually.
Note: EXT:staticfilecache is a fork of EXT:nc_staticfilecache (EXT:fl_staticfilecach before) and has a lots of improvements.
Have fun with the extension!