Extreme Lag with Point Lights?

[rosegoldslugs]

@OptimisticMonkey

How many lights are you using?

The cost of movable lights is directly tied to how many pixels each light affects in a given frame.
So if you have 1000 lights affecting all the pixels in a frame, it will be slow.

Some options:
-Design your scene so there are fewer lights affecting the pixels at any given time.
-Use a combination of movable and static lights. Key shadow casting lights can be dynamic while incidental fill lighting can be static.

You can use several of the built in tools to determine what is costing performance . eg. Stat Shadowrendering

This. Also profile the GPU specifically to see the total light and shadow depth/projection cost. You’re more likely to hit a bottleneck with shadows before reaching one with just overlapping lights, but both can contribute to poor performance significantly. And how expensive are your shadow casting meshes, triangle-wise?