Movable lights slow down visualization after build

Hi,
I’m looking through this issue.
I’m working in VR.
In my scene I have many movable lights. As I build my scene, my visualization in VR Mode slows down, and the fps decrease…
That’s strange, because i’m working on double Intel Xeon Porcessow and a Nvidia 1080 (8 gb)…
Any suggestions?
Thanks a lot!