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We're updating Lighthouse to be based on the same Insights we recently launched in the Performance panel of Chrome DevTools. developer.chrome.com/blog/moving-... This will help align the tools but will be a breaking change. So we'll make that change in Lighthouse 13 in 6 months. 1/3 🧵

developer.chrome.comLighthouse is moving to performance insight audits | Blog | Chrome for DevelopersLighthouse is moving to performance insight audits

Prateek bhatnagar

@prateekbh.bsky.social

5 May 2025

Will it continue to use 3G as its default? I am not sure if it makes sense for everyone anymore

Barry Pollard

@tunetheweb.com

So we use "Slow 4G" as the default. We still think that's right for mobile emulation. See previous discussion here: bsky.app/profile/tune... We also did change the throttling on PSI a few months back to make that more realistic: bsky.app/profile/tune...

Barry Pollard@tunetheweb.com

Some of you complain that PageSpeed Insights is a bit unrealistically show for the Lighthouse test. The PSI servers are a bit underpowered so we're changing the throttling, which should make the Performance score go up when this rolls out in the next few weeks. github.com/GoogleChrome... 🧵 1/5

github.comRelease v12.2.3 · GoogleChrome/lighthouseFull Changelog This release is only for PageSpeed Insights and we expect it to ship within 2 weeks. Notable Changes The CPU throttling factor for PageSpeed Insights has been adjusted (#16256) to ac...

6/5/25, 8:20 am0 reposts1 like

Barry Pollard

@tunetheweb.com

6 May 2025

Check our your site on CrUX Vis, where you can see the typical RTT value for visitors to your site. E.g. For web.dev the typical RTT for mobile is 200ms: cruxvis.withgoogle.com#/?view=loadi... So the 150ms RTT that Lighthouse uses is actually FASTER than the average user for our site.

web.devweb.devGuidance to build modern web experiences that work on any browser.