The game got updated to VS2015 runtimes to remove the performance issue on older i7 architecture.
If you still get the wired performance drops in-game please drop us a note at the Steam Discussions or at [email protected]
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 1246156 · public branch
Steam updated · First observed