Lighting Performance Issues/Glitches in Hammer and Scene

[anthonysharpy]

Describe the bug

https://github.com/Facepunch/sbox-issues/issues/4432 and https://github.com/Facepunch/sbox-issues/issues/4759 both addressed issues with lighting performance. These have been closed, but the issue still remains.

For example, the rendering time increases by 10x when looking across the map (probably due to lights), giving 10-20 FPS:

https://github.com/Facepunch/sbox-issues/assets/55365296/184092f4-f486-4cc9-a732-6e7c8d3a788a

A couple of months ago it also seems some lighting changes were brought into Hammer, and now I can't really use it because the framerate is so low, and there are a lot of visual glitches:

https://github.com/Facepunch/sbox-issues/assets/55365296/54518f7f-7522-4348-b18b-2d5fb65e4f3c

Before the move to scene I was comfortably getting 50-120 FPS in-game and probably lots more than that in Hammer.

To Reproduce

Don't know for sure but probably lots of lights

Expected behavior

See above

Media/Files

No response

Additional context

Ryzen 5 5500 32GB RAM GeForce GTX 1660 SUPER