The copies of the game that are available in “digital” so far hold only 30 frames per second.
YouTube host NX Gamer showed how The Last Guardian version 1.0 works on PlayStation 5, comparing the game’s performance in backward compatibility mode with its performance on PS4 Pro.
Most of the time, the game is 60fps at around 1800p. Minor drops by a few fps are noticeable only in more complex scenes, where the current generation console produces about 25-30 fps.
Currently, you can run The Last Guardian on PS5 at 60 fps only if you have a physical copy. This is due to the fact that in the current version, the developers have set a frame rate limit in order to stabilize performance on the PS4, while you cannot disable it in the settings.
Digital Foundry officials later confirmed that, so far, similar performance from Japan Studio and GenDesign cannot be achieved by installing it from the PS Store.
The situation can be fixed only by one more patch that allows you to remove the fps limitation, but whether Sony will release it is unclear. So far, only games that have been released relatively recently have received such updates, for example, Days Gone and Ghost of Tsushima.