That's correct. Snappiness is what really is important. Mozilla conduct a parallel project called Snappy to improve that specific metric. Note that Memory cons

That's correct. Snappiness is what really is important. Mozilla conduct a parallel project called Snappy to improve that specific metric. Note that Memory consumption is somewhat related to Snappiness: if it is too high, the program will slow down (paging, longer garbage collecting pauses, ...) and feel less snappy.