Hello guys, Recently I was converting an old project which uses World Composision to build a large world to the new World Partition. And in this old project, I am pretty sure that nearly all sub-levels are loaded(FYI, This project is quite huge and the frame rate on a very high-end computer with 4k screen is only ±35). However when I finished the converting process(with HLODs built), the World Partition version of this is not very satisfing(both versions have nearly same frame rate). In my expectation, The World Partition version should have higher frame rate compared to the World Composition version since World Partition only loads part of the world and the rest of the world is replaced by HLOD actors which can be not very computation expensive. Can anybody explains how this could happen? MANY THANKS!