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Performance Panel

Record CPU & render activity to find layout thrashing and long tasks.

Coverage Tab

Spot unused JavaScript and CSS to improve load times.

Network Throttling

Test on simulated 3G, offline and slow devices for real-world optimisation.

Live Inline Editing

Right click → Edit attribute / Edit text → test without editing source directly.

Session Storage & Local Storage Inspection

Debug JavaScript state persisting across refreshes.

Learning these tools will massively boost productivity and confidence shipping changes.

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