"Relative" to what? As you've never actually taken time to see what a stoning involves I don't know what you're comparing it to. Watch footage of a stoning. It's not hard to find. It's barbaric, sadistic, and anything but quick. Read accounts of how they go down. I'm serious here. Do yourself a favor.
So your only reason for not advocating a slow execution...is because people might resent their government. That's it. Not that it's morally reprehensible, sick, grotesque, twisted, and hideous; not that it's sadistic. No. Your true priority comes through: we don't want anybody resenting the government. Excuse me while I pick up my jaw.
Lemme fill you in and hope you get your own clue. Muslims are the ones stoning people these days. Muslims are the folk who think barbarism, and mutilation, and public gang bludgeonings, are a good idea. Strange bedfellows indeed. Bad enough you and others haven't made the slightest approximation of an informed decision on stoning other than your ignorant blatting about doing "what God says to do." (Independent thinking is NOT encouraged when we're talking about beating people to death with rocks; can't imagine why.) No, interestingly enough you're saying that the Muslims got it right this time. How cute.
What about Deuteronomy 25:11-12?