https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/ Copyright © 2017 Tyler Cipriani Tyler Cipriani ikiwiki Tue, 13 Mar 2018 12:49:16 +0000 https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/comment_1_9f3b196a8923d4143bb3ce0bd3bd206e/ https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/#comment-c0535adae0646de55d4bfcac8a1b323a Pratyush Sun, 11 Mar 2018 00:45:00 +0000 2018-03-11T00:45:01Z Hey great article. Thanks for posting. The source article also mentions that “Ideally, the ATF content should fit under 98KB - this allows the browser to paint the page after just three roundtrips to have plenty time budget for server response latency and client rendering.”. Can you explain how do they arrive at the number of 98kb? https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/comment_2_27681298f3bc5c19c14cadc01b4a58f6/ https://tylercipriani.com/blog/2016/09/25/the-14kb-in-the-tcp-initial-window/#comment-93b31443c0551e0b108607159e92c957 Pratyush Tue, 13 Mar 2018 12:49:15 +0000 2018-03-13T12:49:16Z Ok. Got it. They are counting 3 trips for 98KB size ATF content because TCP after initial packets of 14kb, TCP doubles the packet size in each connection to 28 KB, and then 56 KB (TCP packet size keeps on increasing until there is data loss). So in three roundtrips, you can get 14 kb + 28 kb + 56 kb = 98 KB of content!