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Blocking=render: Why would you do that?
Why on earth would you make something render-blocking?!
Colloquially, we refer to them as non-blocking, but even for the handful of milliseconds that the browser is parsing either the JS or CSS contained in them, it’s blocked from doing anything else. Finally, and this is counter to my own preferences and beliefs as a performance engineer, we still risk leaking the experiment to the user when using an anti-flicker snippet. The problem with anti-flicker snippets is that if that four-second timeout is reached, we’ll still display the page even if experiments haven’t completed—the 4000 ms is a magic number that we use to hopefully win a race condition.
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