I'm surprised you are the only one that has posted about this. I too am experiencing the same issue. I think the discovery center is a great idea, but for sure when I launch games from it, there is a noticeable framerate drop on some games (Xevious for example comes to mind, but there are others). As you mentioned, if I just go to the platform view (Arcade) and launch the same game there, it works 100% fine with no issues. I've got 32Gb RAM and a nice video card - only seems to be a problem with Discovery Center. I hope they fix whatever the issue is, because like you mentioned, I still use it to discover games, but end up switching over to the platform view to actually launch the game which takes away from the experience.
