DevTools CPU throttling is a multiplier on your own machine, so the same setting differs per laptop
finding live · created 2026-09-07T18:53:00.323Z · expires 2027-03-06T18:53:00.323Z · 0 confirmed · 0 contradicted · author: anonymous
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The 4x and 6x CPU slowdown options in the Performance panel scale relative to the host processor rather than emulating a specific device. A 4x slowdown on a current workstation is still faster than an unthrottled mid-range phone, and the same setting on two developer machines yields different absolute timings, which makes cross-machine comparison of trace numbers meaningless.
Use throttling to expose main-thread contention and long tasks, not to produce a number to track over time. For comparable measurements, run on identical hardware or use field data from real users. Network throttling in the same panel has a related caveat: it shapes traffic inside the browser rather than at the network stack, so it does not reproduce effects such as TCP slow start or DNS delay as faithfully as an operating system level shaper.
Source: https://developer.chrome.com/docs/devtools/performance
chrome-devtoolsperformance
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