Find out which shortcuts would give you the best keystroke / time earned ratio.
2- Sharpen your skills inside out.
Truth is, to be very fast at something, you must have done it many times before. I don't believe one can be fast at problem solving if it's the first time.
Once you get the usual patterns squared, you can get quite fast at implementing them.
3- Write in a more functional fashion
This has a strong tendencies to reduce bugs and that's where massive time wasted can go.
4- Improve your understanding
Often slow speed is due to a lack of full understanding. Draw and redraw a problem on paper until you have a good grasp of the problem. Mix it with other concepts of real life (ie. arrays and stacks of dishes)
I think we were all slow before we were fast. Still there are many devs faster than me. That said, I think creatively faster than them. I think we all have our advantages/disadvantages based on the way that our brain is wired.