Unreal Engine Issues
Unreal Engine Issues
Bad performance when changing (slider) values for the advanced preview scene
UE - Gameplay - Jul 20, 2016And yes we do have sliders but the performance is bad when you slide them. ...
GPU work performed between PostPresentHandoff and WaitGetPoses
UE - Platform - XR - Jan 12, 2017...I assume this is the SceneCapture2d work. In async mode, we control interleaved reprojection (dropping to 45hz) based on measure gpu time. Since that work is sneaking in immediately after PostP ...
Unfocused Standalone window has reduced performance
UE - Rendering Architecture - RHI - Aug 25, 2020User description: When I run two windowed standalone instances to test multiplayer, the unfocused window gets about 2-5 fps...but if I focus on it, smooth 120fps, yet the opposite screen is now onl ...
Cannot undo actor transform performed during pilot mode
Tools - Oct 26, 2016Cannot undo actor transform performed during pilot mode. The Undo history does not appear to include the movement of the actor that was done in pilot mode ...
Performance drop in Orthographic views when Visualize->Volumetric Lightmap
UE - Graphics Features - Lumen - Mar 4, 2019Severe performance drop when when entering Orthographic view, but only when Volumetric Lightmap is selected. ...
Potential major HLOD dynamic shadow performance issues
UE - Graphics Features - Feb 22, 2017See https://udn.unrealengine.com/questions/336882/hlod-dynamic-shadow-issues.html . Potential major performance issues with HLOD and dynamic shadowing incorrectly drawing sub meshes. Also missing sh ...
ProcessPriority performance consideration with Generation 12 Intel CPUs
UE - Foundation - Cpp Tools - UnrealBuildTool - Oct 26, 2022It has been noted that the default BelowNormal process priority set in UnrealBuildTool is not handled well with the Gen 12 Intel CPUs as processes are only scheduled on the E-Cores which causes degr ...
Significant Performance Drop During Play While Behavior Tree is Open
UE - AI - May 18, 2016Attempting to play in editor, standalone, or VR Preview when a behavior tree that is running is open will cause a significant performance decrease. The framerate drops from ~120 to ~80 fps while the ...
Performance slowdown when ray tracing is disabled due to SetResidencyPriority
UE - Rendering Architecture - RHI - Jul 17, 2025When a game is compiled with ray tracing disabled (D3D12_RHI_RAYTRACING=0) and the GPU the game is running on becomes low on VRAM, frame time is negatively impacted and doesn't recover. The D3D12_RH ...
Performance regression from 4.10 to 4.11 on Sony Xperia M4 Aqua
UE - Platform - Mobile - May 27, 2016User reports that on the Sony Xperia M4 the FPS have decreased from about 25 down to 5 after upgrading to 4.11. ...