If I understand correctly, a professional kosher slaughter has strict requirements, and there is a trained butcher using implements that have to be kept faultlessly clean and sharp. A swift cut through the carotids will make an animal unconscious immediately and dead very quickly thereafter.
This is different by orders of magnitude from some Muslim who kills a goat for his family once or twice a year, hacking slowly through the poor animal's throat, as with the disgusting videos we've seen of Nick Berg's prolonged death.
Halal requirements for slaughter are almost identical to those of kosher.
I'm sure they aren't always implemented properly.