chrome-devtools-frontend
Version:
Chrome DevTools UI
47 lines (42 loc) • 1.84 kB
text/typescript
// Copyright 2024 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
const DEVTOOLS_RTT_ADJUSTMENT_FACTOR = 3.75;
const DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR = 0.9;
const throttling = {
DEVTOOLS_RTT_ADJUSTMENT_FACTOR,
DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR,
// These values align with WebPageTest's definition of "Fast 3G"
// But offer similar characteristics to roughly the 75th percentile of 4G connections.
mobileSlow4G: {
rttMs: 150,
throughputKbps: 1.6 * 1024,
requestLatencyMs: 150 * DEVTOOLS_RTT_ADJUSTMENT_FACTOR,
downloadThroughputKbps: 1.6 * 1024 * DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR,
uploadThroughputKbps: 750 * DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR,
cpuSlowdownMultiplier: 4,
},
// These values partially align with WebPageTest's definition of "Regular 3G".
// These values are meant to roughly align with Chrome UX report's 3G definition which are based
// on HTTP RTT of 300-1400ms and downlink throughput of <700kbps.
mobileRegular3G: {
rttMs: 300,
throughputKbps: 700,
requestLatencyMs: 300 * DEVTOOLS_RTT_ADJUSTMENT_FACTOR,
downloadThroughputKbps: 700 * DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR,
uploadThroughputKbps: 700 * DEVTOOLS_THROUGHPUT_ADJUSTMENT_FACTOR,
cpuSlowdownMultiplier: 4,
},
// Using a "broadband" connection type
// Corresponds to "Dense 4G 25th percentile" in https://docs.google.com/document/d/1Ft1Bnq9-t4jK5egLSOc28IL4TvR-Tt0se_1faTA4KTY/edit#heading=h.bb7nfy2x9e5v
desktopDense4G: {
rttMs: 40,
throughputKbps: 10 * 1024,
cpuSlowdownMultiplier: 1,
requestLatencyMs: 0, // 0 means unset
downloadThroughputKbps: 0,
uploadThroughputKbps: 0,
},
};
const Constants = {throttling};
export {Constants};