Noticed that out of the 8 cpu's listed in System Monitor, 0 A.D. only uses 1 and ~800 MB memory. With a total of ~450 units and ~200 structures the game starts pausing 1-2 seconds increasingly. Details: 0 A.D. version: 0ad 0~r11863-1~ubuntu12.04.1 / compiled svn revision 12663 OS: Ubuntu 12.04 x86_64 CPU: Intel® Core™ i7-3612QM CPU @ 2.10GHz × 8 Memory: 4GB PC3-12800 Graphics: NVIDIA GeForce GT 630M - 2 GB / Intel HD Graphics 4000 Bumblebee: 3.0.1-3~preciseppa1 Swap: 8GB SSD, swappiness 10 Tried different setups, with default Intel GPU or bumblebee-nvidia with setup changes, changed swappiness and now I'm all out of ideas. Besides the "out of memory" bug already filed, I haven't found anything helpful, so I'm open for suggestions