Guys, I have 15MB saves. It's never affected my loading times or game performance. I have a bug where I can't go to Act 3 without a save 302 error, but my earlier saves are all around 14-15MB and don't bug out going to Act 3.
Wife's is the same way. She's on an LGA1150 Win8.1, I'm on 2011v2 Win7. Maybe you guys should list what OS you're on? Might be most of you are on Win10 that's having this problem.