So…wanted some juicy volumetric clouds in my existing 4.25.3 (rtx / dynamic light) project that worked fine without much issue (accept normal/occasional d3d gpu hangs)… copied this project and converted in-place to a 4.26 project and noticed immediately the huge hike in memory usage (and therefore increased d3d hangs/UE crashes).
Where as the 4.25 project consumed between 8-10 GB of my rtx 2080ti running exactly the same project + volumetric clouds resulted in between 15-17GB usage (a practical doubling) making viewport sluggish and not very usable.
Other noticeable issue is on using movie render queue to render even a single still the preview render window takes much longer to appear, run and give a result.
Has anyone else experienced similar performance issues?
Thanks
gpu hang report
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Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/D3D12RHI/Private/D3D12Util.cpp] [Line: 671] pResource->Map(Subresource, pReadRange, reinterpret_cast<void**>(&pData)) failed at D:\Build++UE4\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12RHIPrivate.h:1168 with error DXGI_ERROR_DEVICE_REMOVED with Reason: DXGI_ERROR_DEVICE_HUNG
UE4Editor_D3D12RHI
UE4Editor_D3D12RHI
UE4Editor_D3D12RHI
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor
UE4Editor
UE4Editor
UE4Editor_Core
UE4Editor_Core
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
ntdll