At my first job before MMM, I had a 401k that I was doing the max match of 8% and when I left there, I had about $65k that I rolled over into a 401k. I found MMM right afterwards and so have been maxing the new 401k out at 18k/year but it amazes me that my new account can't seem to catch my old one because of the returns, despite contributing so much more to it.
I've now been at the new job for 4 years now and just hit about $75k in the new 401k but in that time the old account has climbed to 90k! I feel like I'm going to keep playing occam's razor with that account forever, always slightly behind, never quite catching it.