Boiling Shrimp

hate to drag up an old thread, but when i searched for boiling shrimp, this was the one that came up.
i know the method to use, I've done them in the past . but I've only done like 20lbs at a time.
this weekend I'm doing like 80lbs. i have a pot big enough to do that much, should i do them all at once or split them up into 2 boils?
1) is your large pot proportionally bigger than 80 lbs of shrimp as your smaller pot is bigger than 20lbs? Because if not, adding the shrimp will cool that water more and affect your cook time.

and

2) is serving the shrimp hot important to you?