Fallout 76 might offer a higher resolution on PS4 Pro and Xbox One X but the frame rate and overall performance are quite poor on all platforms.
Digital Foundry has conducted their technical analysis of Fallout 76. It runs on the same creation engine that powered Fallout 4 but there are some upgrades made to it to handle the multiplayer nature of the gameplay now. Despite that, the performance of the game is not up to the mark and seems to suffer a lot, especially when the engine gets under load.
Fallout 76 renders at native 4K on the Xbox One X while the PS4 Pro has to settle on a 1440p image buffer, but the performance is almost as abysmal on both platforms. The frame rate targets 30 FPS but can drop below that for an extended amount of time. Since you will be going through a lot of firefights in the world of Fallout 76, the performance can take a hit which has an impact on the controller input.
Even the base console versions are not that safe from the performance issues. The resolution for PS4 is native 1080p while Xbox One employs a dynamic 1080p resolution, but both can drop below 30 FPS just like the Xbox One X and PS4 Pro.
For more details, we recommend to check out this Digital Foundry video and get all the information including a frame rate test, which is better shown in action in the video.
Fallout 76 is available now on the PS4, Xbox One, and PC.