Microsoft's FPS Boost for Xbox Series S and Xbox Series X consoles uses Direct3D-level adjustments to deliver improved framerates, according to a new report. Digital Foundry has also shown that FPS Boost can improve framerates by up to 4x in some cases, with the Xbox Series consoles able to maintain these higher framerates consistently, too.
https://www.notebookcheck.net/FPS-Boost-uses-Direct3D-tweaks-to-deliver-up-to-4x-higher-framerates-for-the-Xbox-Series-S-and-Xbox-Series-X.522958.0.html