Unreal Engine Issues

20 FPS performance drop between 4.7.6 and 4.8 on devices rendering Metal only

User reported a considerable performance drop on iOS between versions 4.7.6 and 4.8. I was able to reproduce this perf drop using the steps he provided. ...

Performing a Hot Reload after changing a custom component code class can make the component unusable in Blueprints, or crash the Editor.

Performing a Hot Reload after altering a custom component code class can make the component unusable in Blueprints, and even crash the Editor. WORKAROUND: Close and re-open the Editor. ...

If a custom code class is modified and a Hot Reload performed, any existing unsaved Blueprints derived from that class can no longer be saved.

When a custom code class is changed and a Hot Reload is performed, any Blueprints previously made from that class can no longer be saved. Possibly related to [Link Removed]. WORKAROUND: Close and ...

Hot reload reported as failed in Visual Studio for projects opened in the Editor after having hot reloads performed successfully previously

If a project is opened in the Editor after previously having a hot reload performed, any subsequent hot reloads started from Visual Studio will result in the build being reported as failed in Visual ...

Renaming a custom component code class and performing a Hot Reload will cause the Editor to crash when a Blueprint containing an instance of that component class is opened.

Renaming a custom ActorComponent class when that class is set as a component in a Blueprint and performing a Hot Reload will crash the Editor if the Blueprint is opened for editing after the project ...

Regression in editor performance in D3D11

D3D11Commands.cpp is doing FName resolutions in the critical fast path. This looks to be a regression from the memory freezing refactor. ...

Severe Performance Drop Using PlanarReflectionComponent and Oculus Rift in VR

Upon moving around when PIE with VR Preview selected, you'll notice there are drops in framerate where the project seems to skip. ...

Masked Mesh has significant performance hit on some android devices

StrategyGame Performance Regression on iPad Mini 4

We encountered this issue during the Mobile Compat pass for 4.13 4.12 FPS/FR: 60/16 4.13 FPS/FR: 47/20 ...

Passing array from blueprint to C++ causes performance drop

Passing a blueprint array as an argument to a C++ function causes a spike in Frame rate, game and GPU. This spike is noticeable when using UnitGraph. Attached screenshots show difference in UnitGr ...