Live A/B website performance testing

Is there a way in Chrome web dev tools, to alter the site (CSS in my case) and measure / compare the loading performance before and after the edits ?

If I change the CSS, as soon as I reload the page (in the Network tab) it reloads the original CSS - obviously.

I would need to somehow make the changes permanent, or save the altered state in order to compare it to the original.

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