Yup, btdt. Ours hasn't slowed down, but what has definitely happened is that he's much better at 10 than at 7 at taking his learning from whatever's around rather than needing a teacher to do it all for him, so in that sense it's fine - at least, for us with a really excellent school it has been. This is going to depend hugely on school and on child's personality, though. Do you trust your school?
Reading I really wouldn't worry about. My immediate reaction is to wonder what it even means for a 7yo to be 4 years ahead in reading. I know there's an argument for that being wrong, but I do still think there's a case for saying that once your kid can read and enjoys reading all future reading skills will take care of themselves, given plenty of material.
Maths: make sure there is challenge; the nominal grade matters hardly at all, it's all about hard problems.
