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Same, I haven't seen a need for it for performance yet across a few companies and open source apps I've worked on.

Every single time I’ve needed to use memo the performance gains where obvious.

A: You'll know when you need it. Until that point one is firmly in the realm of premature optimization.

The post points out that given memoization in many cases avoids serious perf/functional issues not memoizing may be considered premature optimization.

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