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Introduction # I recently discovered that Firefox introduced a feature called RCWN (Race Cache With Network) in 2017. This feature was intended to improve web performance by racing cached requests against the network. Fig 1. Firefox network panel showing cached resources 'raced' againt the network This seemed odd to me, surely using a cached response would always be faster than making the whole re
One of the outcomes of the release of Core Web Vitals (and subsequent inclusion in Google's page ranking algorithm) is that we have been paying more attention to unexpected layout shifts and the cumulative layout shift (CLS) score. Some sources of layout shifts have been simple to resolve: pre-allocate the correct space for dynamic elements, use width and height attributes on images and prioritise
Introduction # Reading the technical press you would be forgiven for thinking that 2020 is going to be a great year for web performance. Repeatedly touted are the blazing fast speeds we will achieve with 5G, the fundamental improvements that HTTP/3 will bring and how new devices will be faster than premium laptops. I fear this outlook could make us lackadaisical about performance. 5G isn’t expecte
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