MS Flight Sim: Unlocked Frame rates f/ VRR Displays

https://www.ign.com/articles/microsoft-flight-simulator-framerate-improvements

TLDR: Parts of the game engine have been rewritten, taking some rigs from 30 FPS with max effort CPU to 60 FPS at 4k. Series X will provide 4k 30 FPS, and unlocked frame rates are possible only for VRR capable displays.