Starting today, Microsoft has enabled FPS Boost for five popular titles on the new Xbox Series X and S consoles - Far Cry 4, New Super Lucky’s Tale, Sniper Elite 4, UFC 4, and Watch Dogs 2. FPS Boost will do what its name suggests - boost the frames per second anywhere from twice to four times. That means that a game like UFC 4 can now run at 60fps, while New Super Lucky’s Tale will be able to hit 120fps. What's most impressive is that the FPS Boost feature doesn't require a game update nor any work from the game developer. In practice the game believes it's still running at its older...
Source: https://www.gsmarena.com/microsoft_makes_older_games_run_faster_on_xbox_series_s_and_x_with_fps_boost_-news-47812.php