The Digital Press

A website’s initial load speed can be significantly improved by keeping the page size under 14kB due to how the TCP slow start algorithm controls data packet transmission. This rule of thumb helps reduce the number of round trips needed to send data, which is crucial, especially for users with high latency connections like satellite internet.

Why it matters: Fitting your site's critical content within 14kB reduces latency-induced delays, improving user experience on slow or high-latency networks.

The big picture: TCP slow start limits initial data packets to about 10, roughly 14kB, to avoid overwhelming unknown network bandwidth.

The stakes: Exceeding 14kB causes extra round trips, adding hundreds of milliseconds, dramatically slowing load times for many users.

Commenters say: Many note this is mainly relevant for users with slow connections; some stress sustainable web practices, while others consider it a minor concern for fast broadband users.