Well i`ve tried with the three API, it tooks a few seconds to open, then just with Vulkan is the one which makes the diference running at 22FPS, until 10FPS only just with vulkan, With DX10 and the default launcher runs more than 120FPS,  also the textures, texture maps, reflects, shadows, particules effects change too much.

LoginId:a0f344d54fcd30650177bba73a24c334

EpicAccountId:

Access violation - code c0000005 (first/second chance not available)

ntdll
ntdll
projectborealis_ue_Win64_Shipping!VulkanRHI::FDeferredDeletionQueue::EnqueueGenericResource()
projectborealis_ue_Win64_Shipping!FVulkanComputePipeline::~FVulkanComputePipeline()
projectborealis_ue_Win64_Shipping!FVulkanComputePipeline::`vector deleting destructor'()
projectborealis_ue_Win64_Shipping!FRHIResource::FlushPendingDeletes()
projectborealis_ue_Win64_Shipping!FVulkanDevice::Destroy()
projectborealis_ue_Win64_Shipping!FVulkanDynamicRHI::Shutdown()
projectborealis_ue_Win64_Shipping!RHIExit()
projectborealis_ue_Win64_Shipping!FEngineLoop::Exit()
projectborealis_ue_Win64_Shipping!GuardedMain()
projectborealis_ue_Win64_Shipping!GuardedMainWrapper()
projectborealis_ue_Win64_Shipping!WinMain()
projectborealis_ue_Win64_Shipping!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

I have sent the info as it said at the end of the test, but also i have uploaded to this link if you wanna see the details: https://drive.google.com/drive/folders/1rbrDqswJ01sQai7ks00ZVg4pkfn_lSn0?usp=sha...

Hope this can help, i really want to see your work, is awesome to see that fans put love and effort for make HL3 real, wish you the best guys