So that would confirm the bug. I managed myself to trigger it even with LOD 0.3. Like I said before, as soon as "non-minimal" LOD is in view, the performance dives dramatically, with sawtooth frametimes. It's worth realising that as soon as you hit sawtooth frametime on a graph, FPS don't matter anymore. That characteristic is indicative of a serious performance problem where a game engine will not and cannot deliver any satisfactory end user experience as it turns itself into a heat virus, akin to Prime95 "benchmark".