Antichamber can be slow and jittery sometimes, especially on systems with AMD graphics cards.

There is no complete fix that works for everbody, but it can help to install the most recent PhysX system software. Antichamber installs a version of PhysX from 2008, despite the game itself being released in 2013 and despite the fact it also bundles (but doesn't install) another version of PhysX from 2010 ¯\_(ツ)_/¯

Uninstall PhysX version 9.10.0224 (the version Antichamber installs)


Download PhysX from https://www.nvidia.com/en-us/drivers/physx/physx-9-19-0218-driver/

Install this version of PhysX (as of May 2021, this is still the latest version)