system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel What if] Why did Ultron kill the universe manually?

I'm probably not the first one to ask this but why did Ultron take so much time to kill his universe? Thanos said that he could snap to make ALL life end. Ultron had the infinity stones after killing Thanos, why didn't he just do something like clap to do the same? He manually went to so many planets and killed all of them but why?
gpt
On some level, he knew that he'd be without purpose once he was finished killing all life in the universe.  When he was giving his little speech to himself right before he percieved the existence of the Watcher, he seemed quite sad about his task being finished.  It makes sense that he drew things out as long as possible.