Benchmark

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With critical-script

not loaded yet

Without critical-script

Run benchmark

Simulation settingsSlow 4G · API latency 200ms · Bundle startup 200ms

Network throttling

No throttlingFast 4GSlow 4G

A service worker stands in for a slow connection.

Added API latency

0ms200ms500ms1000ms

Adds the delay a server spends on a call of its own, calling other services or waiting on a database, before it starts sending an answer.

Bundle startup time

0ms200ms500ms1000ms

How long the browser spends running the JavaScript bundle once it has downloaded it. It stands in for the time a web application framework such as React spends initializing itself and rendering for the first time.