The stuttering sound problem for MAME games seems to have improved somewhat after switching to text only (not logos) in the wheels, but is still present on some games. Those same MAME games have no stuttering whatsoever when launched from HyperSpin. My guess is BigBox is more resource intensive than HyperSpin (which itself is supposed to be fairly resource intensive) when it's in the background. I don't know if it's how BigBox is using threads, memory, or what. At least on my class of machine, it doesn't do all that great. It is an older computer... Running on an Asus P5G41 motherboard with a DuoCore processor and a lower-end (think GT) Nvidia graphics card. Also it only has 4GB of ram. I used to use this PC as my Windows Media Center computer in my family room with a Ceton 4-channel HD tuner card. It performed that task well until I retired it. I did just order another 4GB of ram for it to bring it up to 8GB. I'm hoping that will help things. I also have some newer Nvidia cards that I can throw on it, but I'm not sure that will make much of a difference. OS is Windows 7. I've stripped unnecessary hardware from it and purged almost all programs, including antivirus. (I had been running BitDefender, but after the recent false positives, I have decided to ditch that pile of crap). I might, at some point, replace the hard drive with an SSD.