Potential progress? Have the lightmap queue a full update when it becomes dirty Update mesh immediately when ready and perform initial torch/sunlight update in thread Stash A little better maybe but still screwed. May need a general re-think. Screw it, just do it all in another thread... slight visual glitch with this though when updating mesh in a thread (to investigate) Merge pull request #1 from Facepunch/light-fixes Light fixes