Taking this discussion, @Krzysztof.N ,
If the main limitation of the DDGI are the probes, wouldn’t be possible to automatically set their spacing based on geometry? (More dense around them, like in Importance Volumes).
But, more important and more “current”: why keep hit points relighting, if there have been no changes in light sources nor geometries? I mean, if lights and geo is keeping their same values, wouldn’t be possible to keep the cache and lighting “static”, without the need to update it in every frame? And only do it if anything changes (and only around that change, not in the whole scene).