Tony Vargas
Legend
By the numbers, yes...From what I can tell the most common view is that advancement does naturally increase after 10th level.
One thing that could keep advancement for accelerating as quickly is the difference between awarded and adjusted (for being outnumbered) exp. If you use a lot of large encounters with large numbers of lower-level enemies, the challenge goes up faster than the exp awarded, and the combat becomes more complex and slower to play through. So you have fewer encounters/sessions, less exp awarded per fully-challenging 'day' - and slower advancement. Though whether you really want to linger through the high levels is another question...In order not to hit 20th level too fast I reckon I'll be more conservative with noncombat xp awards after 10th, but I think I'll also accept that advancement is likely to be faster at least 11th-16th.