That's true if your program only does a single unmarshal at a time at a leisurely pace. And in a steady state situation, the memory trashing left behind each in

That's true if your program only does a single unmarshal at a time at a leisurely pace. And in a steady state situation, the memory trashing left behind each individual unmarshal call needs to be paid up by some poor future request. I agree it's unlikely the difference here will be solely responsible for tipping the GP's request above 20ms, but the memory problems could reasonably ruin tail latencies.