This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
Collision boxes become sluggish to move when using higher poly meshes.
High poly boxes attached (60 K and 120K tris)
Users Video for reference: [Link Removed]
1. Open UE4
2. Import attached asset (SM_Box_120K or SM_Box_60K) or higher poly static mesh
3. Open the Static mesh and move select the collision box that is auto generated on import
4. Move the collision box in any direction
5. Switch collision complexity to "Use Simple Collision as Complex"
6. Move the collision box in any direction
Results: The collision box is sluggish to move depending on the triangle count of the mesh in the viewport. Lower poly meshes do not appear to have a sluggishness. Switching the collision complexity greatly increases the movement speed.
Expected: There should be no sluggishness when placing collision meshes based on the poly count of the mesh in the scene.
Head over to the existing Questions & Answers thread and let us know what's up.