'Halo: Reach' runs poorly on the Xbox One

The Xbox One's backwards compatibility with Xbox 360 games has largely worked as promised, but there's now one glaring exception. Microsoft has confirmed reports that Halo: Reach (aka one of the 360's biggest titles) runs much slower than you'd expect. While talk of it being "unplayable" is extreme, Bungie's shooter fell from a largely steady 30 frames per second on the original hardware to the mid-teens -- enough to throw you off during intense action scenes. Others report audio glitches, too.

Microsoft says it's working on a fix, but it's not certain when that will arrive or how well it'll work. Either way, the debacle illustrates the challenge of emulating highly customized console hardware: even if you largely get it right, there are bound to be a few games that slip through the cracks. It's no wonder that Sony is being cautious with its own compatibility plans.