I do think the sp needed for the later levels should be increased by a bit, especially when the level cap is raised, but as for overall.. Maybe only a slight tweak; it is pretty fast, and especially the people who have been around since earlier in the games life feel how ridiculously fast it feels now compared to back when.

Again, I'm not saying that I want it back to the old ways, but the faster it goes up, the less pride you feel for actually having higher level jobs.