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Chrome 67 has enabled Site Isolation on Windows, Mac, Linux, and Chrome OS, which increases memory usage by 10-13% and introduces some problems for web developers:
beforeunload event handlers are not working in cross-site subframes and unload event handlers may have issues with postMessage,I want to save RAM more than extra security. How to disable Site Isolation?
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You can also try opting out of field trials of Site Isolation to diagnose bugs, by visiting chrome://flags#site-isolation-trial-opt-out, choosing "Disabled (not recommended)," and restarting.
Starting in Chrome 92, Site Isolation will treat non-default values of the COOP header on any document as a signal that the document's underlying site may have sensitive data and will start isolating such sites.
The isolation mode gives developers more focus on a container and its contained offspring. This includes: Special overlay to highlight the container on the inspected page. Blur/mask the non-container area to bring more focus to the container.
According to the docs, you can disable Site Isolation by adding Chrome command line switch:
chrome.exe --disable-features=IsolateOrigins,site-per-process
Another way is to go to chrome://flags/#site-isolation-trial-opt-out and select Opt out.
In Chrome 68+, you can go to chrome://process-internals to verify that Site Isolation is disabled.
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