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