I think this is the same for all roles and isn't related to programmers or programming (IMHO). If you want your pay to rise at a faster rate you move. If you

I think this is the same for all roles and isn't related to programmers or programming (IMHO). If you want your pay to rise at a faster rate you move. If you do it too often then your CV looks bad, if you don't do it enough then your pay tends to rise slower than you would like. 3-4 years is that middle ground.