FPS Boost is a feature that doubles or more frame rate increases for selected games in the backward compatibility system on Xbox Series X and Xbox Series S.
As of today, Microsoft has announced the addition of FPS Boost support to 13 more games. It’s all Electronic Arts, and they’re all included in EA Play and Xbox Game Pass.
These games include Battlefield 1, Battlefield 4, Battlefield V, Mirror’s Edge Catalyst, Plants vs. Zombies Garden Warfare, Plants vs. Zombies: Battle For Neighborville, Plants vs. Zombies Garden Warfare 2, Sea of Solitude, Star Wars Battlefront, Star Wars Battlefront II, Titanfall, Titanfall 2 and Unravel 2.
Sea of Solitude 60FPS, other games aim for 120FPS.