Xbox has began rolling out the FPS Boost functionality on a small set of reverse compatible games.
Quote:
Microsoft is launching a new FPS Boost feature for its latest Xbox Series X and Series S consoles that’s designed to make existing games run better. While Microsoft has previously focused on improving frame rates with backward compatibility for its latest Xbox consoles, FPS Boost is specifically designed to improve older games without developers having to put in any additional work.
Some games will nearly double frame rates, and Microsoft says it has seen a few instances where backward-compatible titles even quadruple in frame rates. The first games to support FPS Boost are Far Cry 4, New Super Lucky’s Tale, Sniper Elite 4, UFC 4, and Watch Dogs 2. The improvements vary across games, with New Super Lucky’s Tale now running at up to 120fps, and UFC 4 includes 60fps performance on the Xbox Series S specifically.
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https://www.theverge.com/2021/2/17/2...-feature-games
I assume this will roll out to most back compat games moving forward once testing is done on them.
Digital Foundry also did a review of the games running FPS boost: