Yes smooth lighting i've found (as you said) a definite cause, but what's shocking is that new world run absolutely flawless even WITH the HD TP. And i have 4 Overclockers in my Rotary Macerator, singularity Compressor, and Centrifuge Extractor, and they all work fine... But about this MAtmos, did you say "the turning OFF of MAtmos" or "The turning OF MAtmos" will cause lag?