Engine starts running very slow when lightning needs to be built?

Development Rendering
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1

Hello!

First of all, sorry if this is in the wrong section of the forum! Was not sure which section to post this in.

So I am currently working on a rather large environment and have recently stumbled upon an issue. When lightning is built everything runs super smooth “90 - 120+ fps” but as soon as I place a new object in the scene and the “Lightning needs to be rebuilt” message pops up the fps drops drastically down to like 10-25 fps. I then build the lightning again which takes a while due to the large environment with many assets but should the change really be this drastic? It has made working with this environment quiet a pain due to the sudden low performance the moment I start expanding it with new assets. Is there a work around for this? Could not find much about the issue so figured i’d make a forum post about it!

Computer Specs:
Nvidia 1070 8gb VRAM
i7 6700k 4.01ghz (Skylake)
16gb DDR5 ram
Windows 10

2

You can limit the priority of the process of lightmass or restrict it to only run on certain cores.

3

what lights do you use/what’s the configuration like? If you’re using something very unique it may be challenging the engines shading and lighting.

4

Before the lighting is built it uses dynamic lighting to show a preview of the shadows which has a bigger performance impact.