At Apple I led a forecast system modernization in global gift card operations. The headline number is that a migration that took six hours dropped to fifteen minutes. The number is nice. What it unlocked is the actual story.
When a process takes six hours, you run it as rarely as you can get away with. That means the forecast is always somewhat stale, and planning happens on old data because fresh data is too expensive to get. The six hours wasn't just slow. It was shaping every decision downstream by forcing them onto a slow clock.
Cutting it to fifteen minutes changed the clock. Now the forecast could refresh often enough to plan in something close to real time. The speed wasn't the prize. The prize was decisions made on current information instead of last week's.
This is a pattern worth internalizing. A slow step doesn't just cost the time it takes. It quietly bends everything that depends on it to its pace. When you speed it up, you're not saving hours, you're removing a constraint on how the whole system can operate.