“Halo Reach” Having Performance Issues on Xbox One
Frame Rate Problems and Audio Glitches
According to Kotaku and many others who have attempted to play "Halo Reach," the game running on Xbox One backward compatibility has several problems.
VG Tech has provided a video that showcases the problems for "Halo Reach" on Xbox One.
It seems that people are reporting that the frame rate would drop to the teens (which have not been recorded in this particular video given). Also, others are reporting that the audio randomly glitches.
Microsoft has provide Kotaku a response, stating that they know the problem and they are working quickly to try and fix the emulation issue.
Source: Kotaku