Nevermind, he explained this again more clearly in the TL;DR.
> Every time you're adding something to the document's being ready, you're adding script execution that delays the completion of page loads. Look at the Chrome Timeline's flamegraph when your load event fires - if it's long and deep, you need to investigate how you can tie fewer events to the document being ready.
> Every time you're adding something to the document's being ready, you're adding script execution that delays the completion of page loads. Look at the Chrome Timeline's flamegraph when your load event fires - if it's long and deep, you need to investigate how you can tie fewer events to the document being ready.