There are two or three kinds of (related but distinct) intelligence: speed, and correctness.

Correctness might be divided into accuracy (how good ones predictions are) and precision (how many things one is able to predict).

It is possible to have a very fast intelligence which cannot understand many things but is very correct about the things it does understand; it is possible to have a very slow intelligence which understands most things well enough to make decent predictions but has lots of error, or any other combination of traits.

In practice, if you are slow and correct, you are often thought to be dumb, and if you are wrong and fast you are also thought to be dumb. These are different failure modes, however.