STALKER: Clear Sky v1.01 Patch
@ 2008/09/03Deep Silver has issued the first patch for S.T.A.L.K.E.R.: Clear Sky, bringing to v1.01 the official prequel to the survival FPS game S.T.A.L.K.E.R.: Shadow of Chernobyl. The patch optimizes the performance of the game by approximately 5%. In addition to that, the update improves the overall stability of the game and fixes potential load/save issues. Further, the balancing of the multiplayer mode has been changed.
http://pc.ign.com/articles/906/906864p1.html