As long your card is a DX11 card it should run even with very bad FPS. What branch are you using ? Is something in your setup wrong ? Have you followed the FAQ ?
Q: I loaded a map but there is no indirect lighting. A: Please make sure that…
- Console variable r.VXGI.DiffuseTracingEnable is set to 1
- Console variable r.VXGI.AmbientOcclusionMode is set to 0
- Directly lit or emissive materials have “Used with VXGI Voxelization” box checked
- Direct lights are Movable and have “VXGI Indirect Lighting” box checked
- There is an active PostProcessVolume and the camera is inside it (or it’s unbounded)
- In the PostProcessVolume, the “Settings/VXGI Diffuse/Enable Diffuse Tracing” box is checked