This post should sum up the proposal for community management in austria which Georg Ringer and me sent to the TYPO3 association.
This is a proof of concept of in-memory caching with TYPO3, nginx and memcached.
This post describes a proof of concept for serving TYPO3 with NGINX/HHVM and a PHP-FPM fallback for incompatible scripts. Since I am using debian this post targets debian wheezy.
The performance of TYPO3 can benefit a lot when using HHVM instead of a conventional PHP runtime. The following charts show a comparison of different settings under different load.