I don't discount anyone else's experiences with acceleration, but I do think there is a difference between asking a 9-year-old to work really, really hard and asking a 6-year-old. It's one thing if the 6-year-old WANTS to spend a huge amount of time on homework. If she doesn't, then IMHO it's not fair to insist on it.
The reality is that DS9 isn't actually doing a lot of homework. It's just that he has to work. He got used to doing five or ten minutes' worth of homework now and then and doing well. He can't do that anymore. So this is where the slight suffering is coming in.
I'm not wild about homework, especially for young students (see my thread about a fantasy school that doesn't give homework). That said, the homework that DS9 gets is at least meaningful, rather than being simplistic busywork.
Val