Hmm. I think the main difference between your calcs and mine is that you have implemented a HashMap, while I was assuming a HashSet (so I only need to store th

Hmm. I think the main difference between your calcs and mine is that you have implemented a HashMap, while I was assuming a HashSet (so I only need to store the value, while in your case, you store (key,value)). In any case, the larger the "entry", the less the 8-byte pointer matters. The smaller the "entry", the more the 8-byte pointer matters.