Reliability before redesign
I championed a major redesign, then stopped my own initiative when performance and reliability became the real constraint. Capacity moved to stabilization first; screens that could take 30+ seconds fell to roughly 2 seconds max, long-running jobs moved from 24+ hours or never to mostly about 30 minutes, and a 1,000+ backlog fell to roughly 50 in 3–4 months. Engineering implemented the fixes; I owned the product tradeoff and sequencing. Two quarters later, after the product was healthy enough to support it, we came back and built the new UI.