Too much thinking is like a heavy dish, it makes you sluggish and sleepy. Remember that everything that moves quickly and elegantly through the world does so without too much thought.
My default is deeper thought, occasionally to my detriment. I can only operate quickly if I have extensive experience doing that thing.
Learning new sports or new mental tasks is slow and requires a lot of discomfort, intentionally pushing my body and mind to just do something they don't feel ready for.
I sometimes do wish I could act more quickly but thus far the only method which works is to do the thing a lot.