This update will fix sound stuttering that users were experiencing that would last for longer than a few seconds during normal gameplay. This update will also eliminate this same behavior following a quicksave or autosave. There will still be a short pause while the autosave happens, but not the more drawn out stuttering behavior.
We are still investigating another performance problem on some hardware, which will manifest where the game is getting into a state where performance drops to less than 5 fps and does not recover or crashes.
Next week we will be releasing the Source SDK, along with a surprise for the community.
Lets hope that this patch fixes most of the problems.. I have been reading on a few forums and there seem to be a lot of people having these stuttering problems (even with the new patch) and another problem many people have are crashes. Some can't even load the game because it crashes after loading the first level.