This is why I don't like it when performance is reported in fps, especially when they say things like "with a deviation ranging between 5-10fps at any random point" and "we encountered dips as low as 10fps." That doesn't say anything about what the performance impact is like, being 1fps slower at 100fps is nothing but at 10fps it's a lot.
Anyway, there's no question that the XBox One emulation features slowdowns vs the original that aren't entirely due to vsync since they're happening where the original maintains 30fps. You can see from the frametime measurements (too bad it doesn't have this for the XBox 360 one..) that it oscillates between 33.33ms and 50ms, showing it at least syncs at 60Hz. Too bad there isn't an ms measurement for the XBox 360 part, that would make it a lot clearer what the impact is.
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