10-15% is true for the top performers unless things have changed in the last few years for the better. If you are going to be in the top 10-20% of your grade then you may get 10% or a bit more. Most get less than 10%. What they are quoting is a top end of their bonus. You can get more basic than that, but to get any significant rise you will need to get promoted to manager. It is possible to get promoted after a short period and you may well be told this. In practice vey few do and it will depend on getting enough influential partner support at that first review and outstanding reviews. I did know some people that rattled through the levels much faster than normal, but they are definitely the exception.