Using Sphere Reflection Captures in VR

I am trying to optimize a level.
There are 85 “sphere reflection capture” actors in the map.
do these get baked in like lightmaps?
do they slow down framerate?

Should these not be used in VR?

as I understand it , u can have as many sphere reflection capture actors as you want , refining the reflections.
reflections from these actors get baked and are calculated before runtime, so they don’t have impact (minimal) on performance (framerate)

they SHOULD be used in VR

thank you!