-norhithread (DO NOT USE ON DX12 OR VULKAN)disabling multithreaded rendering commands, gives smoother frame rate and frame time, does not affect FPS, but has a positive effect on FPS stability on dx 11 -NOTEXTURESTREAMING disables texture streaming, helps with stuttering, highest quality textures are always loaded, cons increase loading time, require minimal 8GB video memory -NoVerifyGC flag skips that safety check of GC, which allows the garbage collector to work more quickly, can help with stuttering, require above 8GB RAM -nothreadtimeout the dead rendering thread check can be skipped if "-nothreadtimeout" appears in the command line for UE4Game, can be helpful avoid crash to desktop (CTD) -dx11 Forces DirectX 11 to be used -dx12 Forces DirectX 12 to be used -vulkan Forces Vulkan to be used read it on steam Steam Community :: Guide :: Big Optimization Guide
