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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.

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