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First published: Jul 30, 2020 Last updated: Aug 5, 2020 Tagged: webperf, gds, ramblings. Matt Hobbs Read time: 21 mins Earlier in the year we enabled Transport Layer Security (TLS) 1.3 on the Fastly point of presence (POPs) for GOV.UK. Fastly have been gradually rolling out a whole set of improvements to the cache nodes in their POPs. This includes a new h2o TLS architecture, which was required fo

First published: Oct 2, 2019 Last updated: Jan 5, 2023 Tagged: webperf, ramblings, webpagetest. Matt Hobbs Read time: 149 mins Table of contents Basic Layout 1 - Key 2 - Request list 3 - Request timeline 4 - CPU Utilisation 5 - Bandwidth In 6 - Browser Main Thread 7 - Page is Interactive (Long Tasks) Vertical lines Horizontal timings Request 1 - The HTML Request 7 - A third-party JavaScript file R