The human brain is amazing and can process between 120 to 150 words per minute.
If the words are speech that someone is talking to the person the brain can process up to 500 of those spoken words per minute.
Some people process less words per minute than others because some people are more slow while other people can process many more words per minute.
But on average the brain processes between 120 to 150 read words per minute while spoken words is around 500 words per minute.