When is it "Right" to Reach for contain and will-change in CSS?

css-tricks.com

Are all three of these features “there if you need them” features? Is it OK to ignore them until you notice poor performance on something (like a massive page) and then reach for them to attempt to solve it? Almost “don’t use these until you need them,” otherwise you’re in premature optimization territory. The trouble with that is the classic situation where you won’t actually notice the poor performance unless you are very actively testing on the lowest-specced devices out there.

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