Triage the Slow Screen
Use the RAIL model to pick the right first performance fix.
Vague complaint Users say the dashboard is slow. The first render is acceptable, but a filter click locks the UI for 900ms while charts recompute. RAIL prevents you from treating every performance complaint like a bundle-size problem. RAIL triage Response, Animation, Idle, Load Classify the felt moment first. The right fix depends on whether the user is waiting for input feedback, watching motion, competing with background work, or waiting for first usefulness. Optimize everything Broad optimization burns time before naming the bottleneck. Each symptom maps to a different fix family. The first performance fix should match the moment users can…
Sign up free — one personalized lesson every day, matched to your role and goals.
Already have an account? Sign in