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Website Response & Performance Budget

Model page asset weights and origin TTFB across Slow 3G, Fast 3G, 4G and Fiber, inspect an engineering SVG waterfall against LCP budgets, and export prioritized wire fixes.

All response times are modeled deterministically from your entered compressed transfer weights, network RTT, bandwidth, third-party handshakes and JavaScript parse/compile tax — no external URL probes or remote Lighthouse calls leave your device.

1. Route identity, quick profiles & budget targets

Load a realistic reference profile to compare payload composition and 4-network response times, or enter your own route below.

Route or page name (required to save)

Project or team (optional)

Primary target network

Total transfer budget (KB, 10 to 20000)

Target LCP ceiling (ms, 200 to 15000)

2. Compressed asset payload & origin wire inputs

Enter compressed wire sizes (gzip/brotli KB), origin server Time to First Byte, and distinct third-party subresource hosts.

Origin server TTFB (ms, 0 to 10000)

HTML document (KB, 1 to 5000)

Critical CSS (KB, 0 to 5000)

JavaScript bundles (KB, 0 to 10000)

Hero image / SVG (KB, 0 to 20000)

Webfonts (KB, 0 to 5000)

Third-party hosts (0 to 50 hosts)

3. Budget verdict, SVG waterfall & wire fixes

4-network phase breakdown

Prioritized electrician wire recommendations

Saved performance audits (0)

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