Last week, I finished the first draft of a new script. Bouncing between two titles: "Executive Material" or "Animal Blood and Gummy Bears."
Not only am I getting faster at writing, the first drafts are getting less first-drafty.
So far, I've written two features this year. I've learned that the quantity (and quality) of material output is directly proportional to the quantity (and quality) of material input.
In essence, more books read = more scripts written. Better books = better scripts.