--- title: Loading... [13 kB] (Maurycy's blog) | daily.dev description: A developer debugging a gopher client discovered all downloads stalled at 13 kB, which led to an exploration of TCP fundamentals. The post explains how TCP... canonical: https://daily.dev/posts/loading-13-kb-maurycy-s-blog--cugkb3c8r twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Loading... [13 kB] (Maurycy's blog) | daily.dev og:description: A developer debugging a gopher client discovered all downloads stalled at 13 kB, which led to an exploration of TCP fundamentals. The post explains how TCP... og:url: https://daily.dev/posts/loading-13-kb-maurycy-s-blog--cugkb3c8r og:image: https://api.daily.dev/og/posts/cugkb3C8r.png og:image:alt: Loading... [13 kB] (Maurycy's blog) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Loading... [13 kB] (Maurycy's blog) **[Lobsters](https://daily.dev/sources/lobsters)** · 6 min read · 0 upvotes · 0 comments ## Summary A developer debugging a gopher client discovered all downloads stalled at 13 kB, which led to an exploration of TCP fundamentals. The post explains how TCP handles packet ordering and loss via sequence numbers and acknowledgments, then covers TCP slow start and congestion control — the window begins at 10 packets (~13 kB) and doubles each round trip until packet loss is detected. The practical implication for web developers: the first ~13 kB of a page load is what arrives in the initial round trip, so critical CSS and content should fit within that budget. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Measuring characteristics of TCP connections at Internet scale](https://daily.dev/posts/measuring-characteristics-of-tcp-connections-at-internet-scale-moethlm4v) · Cloudflare · 0 upvotes · 0 comments - [The Internet is Cool. Thank you, TCP](https://daily.dev/posts/the-internet-is-cool-thank-you-tcp-3boxuwpqz) · Hacker News · 1 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/loading-13-kb-maurycy-s-blog--cugkb3c8r) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Loading... 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