I have two so i race them for the quickest resonce
Yea id only treat the fastest of responces. If he doesnt respond fast enough send him back out and try it again. Keep repeating till you get a good one and then give a huge jack pot treat
If your not looking for anything formal you could try speeding him up by throwing the treat behind, you but this wont help you if your looking for a formal recall as strictly speaking the dogs running past you and not to you