Originally Posted by Dillinger
......... snip ...........A really good trigger has very little “creep”. This is the amount of travel from untouched to the point that the trigger has resistance just before the trigger goes to work......... snip...........
You may be confusing creep with "pre-travel" also called "take-up" and sometimes called "trigger slack". Many triggers have a certain amount of initial movement which involves low resistance. This movement is not "creep". It is properly called "pre-travel" or "take-up" and some triggers, especially two stage triggers, have this as a feature. Pre-travel is often associated with trigger safety. It's not necessarily a bad thing and many shooters prefer a trigger with a certain amount of light and predictable pre-travel.
The slight movement after the pre-travel (take up) is finished and before the firearm discharges is often not perceived at all and folks call this apparent lack of trigger movement before the gun fires as "zero creep". Although a good trigger feels as though it has zero movement before the trigger "breaks like glass", there must be some movement for the trigger/sear to function properly. In very good triggers, this tiny movement is so small, so smooth, so un-noticable, so crisp, and so subtle that it feels like it doesn't even exist. You just put an increasing force on the trigger and at a certain point, it fires without seeming to move at all.
Poor triggers which release only after significant movement at the higher force level after take-up is complete are said to have "creep" and that's almost universally considered a bad thing. It's especially objectionable if the creep involves a lot of trigger movement, if the movement feels rough or jumpy, if it's hard to predict, if the required force is variable, or if it seems to be different each time the trigger is pulled.