Digital Foundry details the improvements to the improved backward compatibility on Xbox Series S. In some titles the target framerate will be doubled.
Digital Foundry goes over the details of how backward compatibility works on Xbox Series S. The console will build on the Xbox One S version of the Xbox and Xbox 360 titles, and will begin to scale from there with its own enhancements.
If we look at the resolution, the target 1440p will make the titles of the first console have triple the pixels for each axis. On the other hand, those of Xbox 360 that received improvements for Xbox One X, will see that its native resolution at 720p increases up to 1440p. In this specific case they specify that by not reaching 2160p, as in the premium model of the current generation, it allows that margin for improvement to be dedicated to other areas thanks to the Xbox Series S architecture.
Games with dynamic resolution will aim for higher targets, in addition to having an improved texture filter. The Auto HDR function discussed in Xbox Series X will also make an appearance in it, in addition to improving all load times by remaining installed in the SSD that they have incorporated.
What about performance? We know that just staying on improved hardware will cause the target frame rate to remain more stable. However, Andrew Goossen, system architect at Xbox, says that several selected Xbox One titles will double their performance on both Xbox Series models. “We designed Series S to enhance Xbox One S games in a way that Xbox One X cannot,” says Goossen. “We have made it easy for existing games on Xbox One S to be upgraded to run at double framerate when played on Series S as well.”