Looks like they referenced it later in the article: https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/ https://tylercipriani.com/blog

Looks like they referenced it later in the article: https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/ https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tc... > So why try to squeeze a website into ~14KB? Seems like you should be trying to squeeze it into 1432 bytes. > I found my answer in IETF RFC 6928 – a proposal to increase the TCP Initial Window to 10 segments. The Initial Congestion Window (cwnd) is the maximum number of bytes that a server can send without receiving any acknowledgement that the bytes were received via a client ACK packet. This maximum number of bytes to send is calculated by multiplying some number by MSS. As of RFC 6928 some number is equal to 10 (initially).