Dr Monika Fekete explores the impact of grind temperature on extraction temperature and why shots tend to speed up over time. Dialing in a delicious espresso shot is great way to start your day, be it at work or at home. As the day goes on, you might find that shots speed up and you need to adjust your grinder a bit finer to get the same result. It seems like your grind profile has changed. Does this sound like a familiar story? It might be a common observation, but to date I’m unaware of a viable explanation backed up by solid data.