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Add want: I want the devtools to throttle internet connection by different latency times as well #844

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aarongustafson merged 3 commits into from
Apr 14, 2026
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Add want: I want the devtools to throttle internet connection by different latency times as well #844

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Add want: I want the devtools to throttle internet connection by diff…
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Fix em dashes and US spelling in want body
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26 changes: 26 additions & 0 deletions wants/94f805e2-68d1-4132-a3fd-2385f9ecb899.md
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---
title: I want the devtools to throttle internet connection by different latency times as well
date: 2026-04-14T18:30:49.707Z
submitter: kronaemmanuel
number: 94f805e2-68d1-4132-a3fd-2385f9ecb899
tags:
- devtools
discussion: https://github.com/WebWeWant/webwewant.fyi/discussions/723
status: discussing
related:
- title: Chrome DevTools - Simulate slow network connections
url: https://developer.chrome.com/docs/devtools/network/reference/#throttling
type: article
- title: Firefox DevTools - Throttle network speed
url: https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/throttling/index.html
type: article
- title: WebPageTest - Network Throttling
url: https://docs.webpagetest.org/getting-started/
type: article
---

Browser devtools let me throttle my network's download and upload bandwidth to simulate slow connections, but they don't let me add artificial latency (round-trip time). Latency has a fundamentally different effect on perceived performance than bandwidth alone—a high-latency connection (like a satellite link or a mobile device in poor coverage) feels sluggish even when its raw throughput is adequate, because every request waits for that extra delay before any bytes arrive.

I want to be able to set a custom latency value—for example, an extra 100 ms, 200 ms, or 500 ms RTT—directly in devtools, just as I can already set a custom bandwidth cap. Presets for common high-latency scenarios (satellite, 2G rural, roaming abroad) would be even better. Without this, I have to reach for external tools like a VPN or a local network proxy to simulate realistic latency conditions, which is awkward and slows down my workflow considerably.

Having latency throttling built into devtools would make it much easier to test and optimize web applications for users on high-latency connections, without leaving the browser.
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