It is mostly web based apps such as scrolling in Facebook, YouTube or the internet that shows the most stutter. It makes sense that those slow down when I have things using up bandwidth running in the background, so I expect it. Things that don't use bandwidth or anything to do with remote signals like some settings menus or just after I turn this phone on is when I also experience stutter or lag. When this phone is on for quite some time or it just has barely been on YouTube, Gmail, the Stock Browser, Google Chrome and other Google based apps take long a long time to load, most of the problems if not all happen in Google apps. Clearing the cache and data in anything has no impact. Doing a factory reset has no impact and just restarts the problems I did eliminate. This phone was advertised to operate just as smooth as any other device in its class. The international Alphas seem to be running good and I did have an S3 and that thing did not have the troubles this thing has. The S3 could be rooted unlike this phone otherwise I probably could eliminate the source. I did clear most of the bloatware I wasn't using or I wasn't able to. Recently I have been led to believe the problem is a pre-installed app and I am starting to suspect an AT&T app or something they do to phones when they get them. Their customer service likes to believe there is no problem and just tries to get me to do the basic troubleshooting techniques. Samsung does the similar crap. I am thinking about wiping my hands of Samsung and I wish I could get the LG V10 and put this mess behind me.