News from Steam's official website indicates that the Source engine powering Half-Life 2 and Counter-Strike: Source has been updated with some minor optimizations:
- Source Engine
- Improved the performance of writing out save games. This will reduce the pause when you pass over an autosave trigger in Half-Life 2, or when you press the quicksave button
- Improved the performance of writing out the thumbnail image for save games. This will also reduce the pause when passing over an autosave trigger or pressing the quicksave button
- Increased cache memory usage for machines that have greater than 512MB of physical memory. This will reduce hitching due to cache thrashing.
- Optimized the sound cache manager, which will reduce hitching as a result of sound cache thrashing
- Minor optimization to the world renderer and world collision
- Minor optimization to the way that asynchronous sound files are loaded
- Optimized the way that sounds were loaded that are trigged by acting sequences
- Optimization to reduced the number of times model sequences are iterated on per frame
- Fixed rcon packet bug that was accepting negative packet lengths
- Fixed rcon server failing on server restart
Half-Life 2
- Weapon script files are preloaded at startup, instead of when they are accessed. This will reduce some hitches while playing Half-Life 2
Linux Server
- Added "-pidfile" command line argument to output a pid file on startup
Condition Zero
- Fixed "Your server is out of date Please update and restart" error
we need some real fixes for cz... last time its been updated was like 6 monthes ago 
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