The limit ($19k contribution) is around 17% of my pretax, I'm just frontloading it right now. A lot of my friends put in 90-100% into their 401k because they are already wealthy.

Our compensation cycle is 1 per year, and it's unlikely to get more than a COL raise at my company unless you have top 5% performance. I've tried getting other offers but the best I've gotten is still less than Google new grad (I now have ~1 yoe)