Why a 1KB Optimization Beat Rivals' Load Time by a Mile?
Boost site speed 600ms by cutting 1KB? TCP Slow Start explains this performance hack for faster first-load.
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Hello everyone, as an architect, I wrestle with system performance every day. We’ve talked about caching, asynchrony, and database optimization, but today, I want to discuss a performance detail you might have never noticed.
Imagine this scenario: your website’s homepage is optimized from 15KB to 14KB, a mere 1KB reduction, yet the loading speed improves by over 600 milliseconds. But if you optimize from 16KB to 15KB, also a 1KB reduction, the speed improvement is negligible.
Doesn’t this seem a bit counterintuitive? Is network transmission playing some kind of “tiered pricing” game?
Indeed, it is. Behind this lies one of the most fundamental, yet often overlooked, rules of the internet: TCP Slow Start. Understanding it will open a new door to frontend performance optimization, especially for improving first-screen loading and user experience, giving you that “aha” moment of clarity.