Performance should be much better now! (Though the intro sequence is still being worked on, the game itself should run better).
-optimized culling
-optimized smoke
-optimized doors (doors cull separately from rooms)
-SCP-106 now leaves his trail
-173 can no longer travel down to 939 rooms
-doors no longer open after first room uncull
-removed SCP-055
Optimization Update
Source: Steam Community (opens in a new tab)