Good point. It's not really relevant for local variables I guess, because those caches are invalidated quite elegantly (you'll still find cases Im sure where th

Good point. It's not really relevant for local variables I guess, because those caches are invalidated quite elegantly (you'll still find cases Im sure where the programmer took that too far). I dont have all the cases in mind but, for example, storing results in object members is common and more often than not, detrimental. Also, there is the events. Events are a caching mechanism as well. They are an optimisation and they are evil. Now don't get me wrong, if you have a bottleneck, events can be a great optimisation. The whole point being, FRP, while having some cool features, is mostly fixing bad programming practices.