This is a screen shot from a superintendent written article in Superintendent Magazine. I like this because the author simplifies and breaks down the 5 major variables that we can manipulate (that we have control of) to speed up or slow down, golf greens. #4 mentions irrigation, implying we can withhold irrigating to create faster greens. This is true and as you can imagine, rainfall also impacts green speed but something we can't control. Finally, general weather conditions dictate how much of the following things we can do. If the sun isn't shining, the grass isn't making food (via photosynthesis) to be able to recover from the stresses we put on the turf.