If you have time please try out my voxel landscape test. A bunch of changes were made that should make it more responsive. (current scene details: 1024 64^3 objects over a 4096x4096x8 landscape)

https://lardratboy.github.io/testbed/streamer/stream-viewer.html?world=scatter%3A1&eye=362%2C1993%2C1070&yaw=0.638&pitch=-0.875&depth=12