PageSpeed: Avoid CSS @import
Using CSS @import in an external stylesheet can add additional delays during the loading of a web page.
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Details from Google
CSS @import allows stylesheets to import other stylesheets. When CSS @import is used from an external stylesheet, the browser is unable to download the stylesheets in parallel, which adds additional round-trip times to the overall page load. For instance, if
first.css contains the following content:
The browser must download, parse, and execute
first.css before it is able to discover that it needs to download
Read our Lighthouse documentation to learn more on avoiding CSS @import.