How to get better at quick games?

When I play otb chess I do not do well in fast games. My rating in chess in real life is 1257, but my quick rating is in the 600s. In general, I am not a quick thinker. When I took two IQ tests, I scored in the top 1% for a test where everyone who did it was not timed, but when I took a test where not timed I scored only in the top 30%. I am just not able to think quick, it is very frustrating as I lose to people with half my rating in 30-60 minute games, but in log games I do well. Can this be improved or not? Thanks for the help.

Also: I have a minor learning disability and I think it impairs my quick thinking abilities, Idk if that is important.

make moves before they happen, you'll get a hang of predicting your opponents moves