I had a gut feeling that my general-purpose subagent was the slow one. Then I measured it: 18 seconds on average, faster than Explore at 22. The real drag was code-reviewer at 37 seconds. Changing one habit based on that number dropped my weekly Claude Code spend by roughly 15–20%. I made a couple hundred thousand yen a month as a student juggling side gigs, got laid off and went back to zero, and spent six months building an autonomous Claude Code setup that now runs at about ¥1.2M in ...