My tip to improve your typing speed is to practice over and over again.

When my fingers hurt after too much time on the keyboard, I get bored and stop. However. this game happens to be fun and addicting most of the time. I guess that is good, for the most part. As they say, " no pain no gain." So, this suggests that if my fingers are hurting, that means that I am having a good time learning, improving and my skills are developing.