Introduced in February 2021, Microsoft’s FPS Boost is an exciting feature that leverages the increased performance of its Xbox Series X|S consoles to play select backward-compatible games at double (and sometimes quadruple) their original frame rate. The latest title to get support for FPS Boost is the final installment of Bandai Namco and From Software’s popular action role-playing series, Dark Souls III. Dark Souls III players can now enjoy the game at up to 60 FPS on both Xbox Series X and Xbox Series S consoles. The original version of Dark Souls III was capped to 30 FPS even on the Xbox One X.
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— Xbox (@Xbox) July 8, 2021
We've updated Dark Souls III with FPS Boost on the Xbox Series X|S: https://t.co/KTcFk7PBGe pic.twitter.com/ExqlzC3Fp4
[…] From Software never went back to the Xbox One version of Dark Souls 3 to add One X support, meaning that 900p30 has been the upper limit of performance on Xbox consoles since the game’s original launch. Not only that, in common with From’s other 30fps console offerings, inconsistent frame-pacing added a certain degree of judder to the game, something baked into the engine that extra back-compat horsepower could not address.
Sources: Xbox, Major Nelson, Eurogamer