I think this is super interesting and we can go completely off the rails taking this to its logical extremes. Like, the entire planet earth is an intelligence that arises from all interactions between all living things on the planet. In this sense, the speed of thought must be considered extremely slow, with even the most minute decision taking decades if not centuries.
There is a theory of consciences (using theory very lightly) that says that conscience is an inherent property of the universe (like gravity) and that any and all systems has conscience. Most of these are not recognizable by conscience humans (although we all seem to agree that we have a sub-conscience, so we are open to the concept of different types of consciences).
"Waking up: a guide to spirituality without religion" has a good chapter on this, where he starts with how people who've had their corpus callosum cut, and through experiments we can see that the two halves work independent, but the person is unaware of this. Their experience is still one conscience, even though their do things or know things that is not apparent to the conscience that outsiders generally would communicate to. He then goes on to argue how there can be multiple consciences that are unaware that they are "trapped" and not in complete control.
The author is not the only one to bring out this argument, but I thought it was well put in that book.
I really like this theory, while at the same time considering pretty far out.