The frame rate-analysis wizards at Eurogamer's Digital Foundry confirmed the good news after testing older Xbox One games. Many titles won't see any boost at allwhich is what we found in cursory testing of 15 games, both for the normal system and for its backwards-compatibility library. However, if an older game runs on Xbox One S using either unlocked frame rates (meaning, not tied to v-sync) or dynamic resolution (meaning, it can scale down from 1080p on the fly to improve performance), players might see the a boost by as much as nine frames per second.