It's hit or miss I've had this app for several years now and although it's great when it works  sometimes it does lag a lot with the audio enabled. I've also had many issues with save states bugging and crashing the entire app. That kind of ruined a few games for me because all of my save slots ended up crashing and wiping out any progress I've put into the games. Hopefully this issue will be fixed in the future.
November 20 2016