Most latency bugs I see are I/O or pooling issues, not CPU. Fixing connection pool starvation once improved throughput more than refactoring code.

• Eventual consistency is fine—until business workflows assume real-time guarantees. That’s where compensating actions beat distributed locks.

• Autoscaling works best when boring. Proper resource limits and graceful shutdowns solved more issues than complex scaling rules.

The hardest part of modern web dev isn’t React vs Angular—it’s coordinating async systems: UI state, network latency, background jobs, and now AI calls. Most bugs live between those layers.