The feature adds a performance.measureUserAgentSpecificMemory() function that estimates the memory usage of the web page. The website needs to be cross-origin isolated to use the API.


Web developers need an API for measuring memory usage of their applications in production. The use cases include a) analysis of correlation between memory usage and user metrics, b) detection of memory regressions, c) evaluation of feature launches in A/B tests, d) memory optimization.




Specification link

Proposal in a personal repository, no adoption from community

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Search tags

JavaScript memory, crossOriginIsolated, performance.measureMemory(),

Last updated on 2021-12-13