I learned over time how to make my writing concise and it is actually far easier to waffle on. But one tip that helped me was one idea = one line. One paragraph = two ideas at most. That means short, snappy writing, which of course helps pace.
Get the pace right in whatever you're writing and you won't want anything slowing that down. Say what you have to say and get out is the motto I try and use on all of my writing. It is amazing how easy it is to repeat yourself so on that note time to stop here!