View in HD at . If you have the Dock set to automatically hide, then you may not like the default amount of time it takes for the Dock to appear, and the speed of the animation. You can customize these by using the Terminal to change two hidden macOS preferences. You can delay the appearance of the Dock so that you can access other items at the bottom of your screen. You can also speed up or eliminate the animation if you find it is too slow for you.