http://bugs.winehq.org/show_bug.cgi?id=20602
--- Comment #1 from Luke Bratch l_bratch@yahoo.co.uk 2009-11-07 10:00:26 --- I can confirm that I see the same thing. With multicore rendering enabled, only one CPU core is utilised by a hl2.exe thread. Unchecking, then rechecking one CPU box in wine taskmgr causes two hl2.exe threads to utilise a CPU core. At the lowest framerate part of a given map, this increases the FPS from around 70 FPS to 110 FPS.