http://www.eurogamer.net/articles/digitalfoundry-2015-witcher-3-wild-hunt-performance-analysis
The first distinction is that PS4 caps its frame-rate at 30fps (with v-sync), while Xbox One runs with no cap at all to allow a variance between 30-40fps during play. This means Sony's machine is in theory capable of a smoother experience - with the cadence of frame delivery forced to a consistent rate. However there are issues on the Sony side side as well, and
the net result is that neither feels truly smooth, though for very different reasons.
To start with cut-scenes, a firm 30fps line is held on PS4 during an early griffin encounter, and in practice this gives us smoother motion compared to the 35fps read-out on Xbox One (higher frame-rate does not automatically mean a better experience overall,
something we've covered in-depth before).
However, the problem here is that if the PS4's frame-rate drops below this number, it instantly locks to 20fps. It's an instant switch, much like the double-buffer method of v-sync seen in
Metal Gear Solid 4 on PS3. In one later scene involving heavy ice effects,
it's notable that Xbox One does glance this 20fps figure at a similar moment, but unlike PS4 it's able to waver up and down the scale more freely. Meanwhile, Sony's platform is stuck at this value for long stretches of a scene.
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