Dependency-based prioritization makes HTTP/2 much faster than SPDY
Background HTTP/2 provides two methods to prioritize streams (e.g. files being served). One method is called weight-based prioritizatio...
Dependency-based prioritization makes HTTP/2 much faster than SPDY launched on April 16, 2015 with 67 votes, #847 of 3,600 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
Kazuho's Weblog is a personal blog that discusses web technology topics, including an analysis of HTTP/2's stream prioritization methods compared to SPDY. The post examines how dependency-based prioritization in HTTP/2 differs from weight-based approaches and explores performance implications for browser load times. The blog serves as a technical resource for developers interested in web protocol optimization.
written from the facts on this page · September 2026
From the sources
Slight correction. SPDY priorities were similar to dependencies in that higher priority streams were to be delivered before lower priority streams ( https://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3#TOC-2.3.3-Stream-priority ). It was only in HTTP/2 that the priorities became weights. Thank you for the correction. I had thought that the priorities in SPDY is weight-based since in Chrome they are mapped to weights of HTTP/2. If that is the case, is my understanding correct that Chrome actually becomes slower by switching from SPDY to HTTP/2 in terms of first-paint time, in case of viewing a web-site like the one explained on this blogpost? Correct, at least until Chrome moves…from blog.kazuhooku.com
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