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Note:For the latest release notes, see this Steam News page. This page is currently up to date as of May 2023.
Gamecode is currently last updated on GitHub in Sep 10, 2015, and they do not contains any bug fixes and new features introduced from

Half-Life 2 and

Portal after the Steam Deck respectively.

Source SDK 2013 Update 10/2/2014

An update has been published for all users. This brings the multiplayer base in-sync with TF2 as of September 30th.

General:
- Client/server memory improvements
- Fixed a client crash when switching between windowed-mode and fullscreen for macOS and Linux clients
- Added experimental cpu_frequency_monitoring convar to detect thermal throttling. If you have performance problems on Windows, add "+cpu_frequency_monitoring 2" to the command line to see if CPU thermal throttling is an issue. If the displayed CPU frequency percentage drops below about 80-85% then you may have a problem with your CPU slowing down due to overheating. If it drops below 50-55% then you may have a serious problem. CPU overheating can be caused by overclocking, insufficient cooling, insufficient airflow, failing or dirty fans, or other causes. For more detail see https://support.steampowered.com/kb_article.php?ref=2715-YIPD-6873
Virtual Reality:
- Fixed selecting the wrong refresh rate when running on a display that does not use the desktop refresh rate