3.5.5 Migration Guide
There were some physics bug fixes in 5.5 over 5.4 so I ripped most of the workarounds out from the grasping hands manny blueprint asset.
5.5 has significant concurrency improvement for rendering, I haven’t done full performance checks of deferred vs forward but I would expect those improvements to mostly come in on the deferred renderer. It may be the more optimal VR renderer in 5.5+ (PCVR only).