Intel Haswell Linux Performance Improved A Lot In 2013
The Doom 3 performance on the open-source Linux graphics driver effectively doubled in speed over the course of 2013 for this Haswell HD Graphics 4600 system.
OpenArena
OpenArena 0.8.5 was nearly twice as fast when moving from Ubuntu 13.04 stable to the current Ubuntu 14.04 LTS development state for this Intel Core i7 system.
The OpenArena 0.8.8 performance was up slightly for the Core i7 4770K.