Page Load Timing Calculator

Simulate and break down Navigation Timing metrics (DNS, TCP, TTFB, DOM Processing, and Load Complete) based on latency and payload size.

Simulation Parameters

Connection Type / Latency

DNS Lookup (ms)

TCP + TLS (ms)

HTML Size (KB)

Server Response (ms)

Client Processing & Assets (ms)

Performance Timeline Breakdown

Total Page Load Time: 535 ms

DNS

TCP

TTFB

DOM

🔌 DNS: 30ms

🔒 Handshake: 80ms

⏱️ TTFB: 150ms

⚙️ DOM & Load: 275ms

Navigation Timing API Reference

1. Measuring Real User Metrics (RUM)

Use performance.getEntriesByType('navigation')[0] in browser consoles to inspect exact millisecond timestamps for production visitors.

2. Optimizing TTFB

Time to First Byte combines network latency with server execution time. Implement Edge caching and database query optimization to reduce TTFB below 200ms.

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