Going into conditional connection rooms such as SD_TX01 in SD 1.2 seem to cause a lot of lag and eventually graphics freezing due to
IndexOutOfRangeException: Array index is out of range.
RegionKit.ConditionalEffects.CECentral.RoomEffect_FromString (On.RoomSettings/RoomEffect/orig_FromString,RoomSettings/RoomEffect,string[]) <0x0019a>
I am unsure whether this is version specific or 100% related to the conditional rooms, but that is where the bug consistently happens. Moving the slugcat with dev tools noclip also immediately causes the graphics to freeze.