Hey Everyone,
The Forest currently requires a minimum of 4 gb of ram to run correctly. We've been notified that Windows 32bit by default may not be using the entire 4 gigs on your system.
Some helpful users have posted a guide on the Steam community hub for how to make sure your windows version is using all of your available memory. http://steamcommunity.com/app/242760/discussions/0/522730535910093920/ This is a temporary fix for users who are comfortable editing their system settings, however we hope to get a better fix to this issue available soon.