https://wccftech.com/monster-hunter-world-pc-fix-cpu/

A new update is going to be released soon for Monster Hunter World on PC, and it will introduce fixes for issues introduced by the release of the Iceborne expansion.

Capcom confirmed that the Monster Hunter World PC 10.12.01 update will fix high-level CPU utilization during gameplay. The update also introduced some save files issues that saw many lose their saves, which is also getting fixed by the upcoming update.