I have an actor that has an InstancedStaticMeshComponent, of which I add about 100 x 100, 10000 instances. Performance is fine while playing the game, nothing wrong there, however while I am playing the game and go to the Scene Outliner and click on the actor the editor hangs for about 20 seconds or so. When its finally done doing what its doing the editor runs at about 8 FPS. When I click on another object in the Scene Outliner the editor hangs for a while again, then when it comes back the FPS is normal again. When I reduce the amount of InstancedStaticMeshes it hangs for a shorter time and the FPS is not impacted as much.
Hi ,
Thank you for your report. I was able to reproduce this and have entered a bug report, UE-7808 to be assessed by the development staff.