Title.
Running around a world with this mod loaded you'll get massive TPS lag spikes (which can last around 20, 30, or even 40 seconds somehow) whenever a structure, big or small, generates.
And even with common performance mods like FermiumASM, VintageFix, etc, this still happens. So this is clearly either a Vanilla and/or Recurrent Complex problem that no one has bothered to fix.