[kareemsabri]

He touches on this in the piece briefly.

> I think as developers, we tend to overestimate how expensive re-renders are. In the case of our Decoration component, re-renders are lightning quick.

Certainly it's there for a reason, and you may have expensive operations, but in my experience developers reach for useMemo much too early and often, and it just adds complexity to their functions. The cost of checking the parameters for changes adds overhead that may be more expensive than just re-doing the "expensive" operation. My rule of thumb is if the operation is less than O(n) where n < ~5000 I don't reach for useMemo.

There have been some benchmarks done on this, and when it pays off to use.