Were you looking at the Clear line for non-Precheck people, perhaps? (I can't remember if Denver had a separate line for that, but many airports do). I was in

Were you looking at the Clear line for non-Precheck people, perhaps? (I can't remember if Denver had a separate line for that, but many airports do). I was in the Precheck line without Clear, and the Precheck + Clear people moved way faster to the head of the line I was in. (To be clear, there are two separate Clear lines in many airports, one for people with Precheck and one for people without it. So four lines total, normal/precheck/normal+clear/precheck+clear). ----- But regardless, sometimes one of the lines will be shorter than others. Sometimes regular is faster than Precheck too (but you'll have to take off shoes and take laptops out, etc.). Some entrances will also have shorter lines than others. But having both PreCheck + Clear means you can choose from any line you want. If the PreCheck line without Clear is faster, well then, just go in that and skip Clear this time.