chrudimer:
Hmm, as far as I understands it static lights do have a cost on performance as they increase the shader instruction count (so volumetric lightmaps to light movable objects are more costly than surface lightmaps) but it is a fixed cost that does not depend on the amount of static lights since everything is baked into lightmaps.
Never thought of that one, but now I will make sure that all my textures that have an alpha channel use the BC7 compression. Thanks for that one!
100% correct. Lightmaps can be shunk to near-non existent sizes though, and said shader cost is so low it can be flat out ignored, as it is the same cost as some basic math, Ex: Adding a few variables