[eatonphil]

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

[eh9]

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

[sibeliuss]

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

[atom_arranger]

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