Turning off shadows

From memory of a twitch stream on the making of Robo Recall, they are getting some performance gains by faking shadows. I’m finding that shadow processing is taking up 5ms so I’m also trying to fake shadows.

Are other people trying to do this? Does 5ms out out 12ms from the GPU profile seem a bit high?

I tried doing some basic ray tracing and fake the shadows. Looks more like ambient occulsion. But anyway the GPU profiler says 5ms in VR, so that is good.

The view is from the space ship. And the blue are pipes that will connect things together.