Yeah series X seems to drop the worse out of all 3 in terms of performance.
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Performance-wise, there's the sense that frame-rate isn't quite where it should be, particularly in the new 128-player modes. In terms of resolution, both PlayStation 5 and Series X target 4K at 60 frames per second, dropping to 1800p in busy scenes (a wider DRS window can't be ruled out, of course, but that's where the counts took us). By and large though, drops from the target resolution are relatively rare - they both turn in a sharp and stable image that looks great on a 4K display. Series S? It seems to vary between 1080p and 1296p based on my tests, with the junior Xbox presenting a blurrier image and some reductions to effects like foliage density.
Performance tends to vary according to player count. The modes with 64 players and below, such as hazard and portal modes, seem to run great on all current-gen platforms. On Series X, S, and PS5 the readout is 60fps on each console with only occasional single frame dips, essentially undetectable in the run of play. These modes feel great to play, though the scope is much smaller than the 128-player mayhem of the main game - and it's here where we have problems, with all consoles dropping performance in intense battles, particularly with many players present or when flying aircraft. On PS5 and Series S these problems aren't too bad - there's generally a pretty solid 60fps with occasional dips. It's not ideal, but it's very playable and these problems are not a major impediment to the experience. At its lowest, we see readouts in the low to mid 50s during more intense gameplay.
There's some occasional stutter on all consoles, though it seems worst on Series X: 50ms pauses occur regularly, although these can last for hundreds of milliseconds at worst.