I'd guess that the mean request size is misleading though - it is presumably the average of a mix of lightweight CDN requests and gargantuan app requests loaded

I'd guess that the mean request size is misleading though - it is presumably the average of a mix of lightweight CDN requests and gargantuan app requests loaded up with the egregious cookies jgrahamc mentions. It's not hard to imagine a healthy number of requests hovering right at the brink of breaking into two packets with a 1500 byte MTU.