Some dogs just aren't quick and flashy and destined to be competitive in sports like that regardless of breed. It might just be an honest assessment of the dog. Doesn't mean the dog can't do it for fun. Some dogs are explosive for cues naturally some are on the cusp of being there and can be made that way. Not all dogs can be "made" into super fast and flashy beasts. If that's what you want you have to go looking specifically for it.