Steps for reproduction:
1) Download the project below
2) Generate the lighting
3) Ensure that gizmos are enabled for light probes and light probe proxy volumes
4) Compare editor performance to play mode experience
5) Observe the low performance in scene view

Notes:
- Light probe proxy volumes are used in place of lightmapping
- In the documentation. it is specified that the feature is intended to be used by large DYNAMIC geometries that cannot use lightmaps (e.g. large characters)
- In profiler, it can be observed that light probe proxy volumes update every frame in Scene VIew