I don't think that language and thought are the same thing, and I certainly don't think language affects speed of thought, but I think in English all the time.

I don't think that language and thought are the same thing, and I certainly don't think language affects speed of thought, but I think in English all the time. It depends on the person, really. Some people have a strong internal monologue, others have a weak one, and others don't have one at all. Its a weird phenomenon, and AFAIK nobody knows why people have varying levels of internal monologuing.