or they leak memory. or a heavy request generates gc activity which impacts other requests. i've seen site outages in large companies due to these sorts of bug

or they leak memory. or a heavy request generates gc activity which impacts other requests. i've seen site outages in large companies due to these sorts of bugs. multiple times. this is a major set of problems that you avoid by having a memory model that fits the domain (http services). php sort of did it by accident, but it works. BEAM gets this right as well.