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Co-authored-by: Kristján Oddsson <koddsson@gmail.com>
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In our mob pairing session called "Making Dotcom Fast" we ran into an issue where we're calling
lazyDefineover 200 times in quick succession. This becomes quite expensive ascancelAnimationFrameis O(n) and we're calling it 200 times meaning we end up with thousands of iterations that ultimately do nothing.In order to prevent this cost on page load, we can overload
lazyDefineto take an object of element->callback pairs, meaning we only callobserve()once. This then needs a tiny refactor on the consumer side, but it turns this:into this: