I've been coding for over 20 years now! (WOAH, do I feel old)
I've touched just about every resource imaginable under the Sun (too bad they were bought out by Oracle)
My absolute #1 that everyone always seems to miss room these lists: minimise DOM complexity. This is the single most performance thing that users will notice once the content loads client side. The simpler the DOM, the quicker CSS rules can be applied and JavaScript selectors can search for the right nodes. Fast initial load times are worthless, if the site kills the CPU when trying to make any changes at all to the dynamic content.
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My absolute #1 that everyone always seems to miss room these lists: minimise DOM complexity. This is the single most performance thing that users will notice once the content loads client side. The simpler the DOM, the quicker CSS rules can be applied and JavaScript selectors can search for the right nodes. Fast initial load times are worthless, if the site kills the CPU when trying to make any changes at all to the dynamic content.