Yeah, this is a really hard thing to get right in general guides or tutorials since there are so many assumptions underlying the decisions and people might end up reading one far enough in the future that thing have changed – we saw that with connection limits and caching esoterics which became obsolete once IE6 disappeared.<p>The main thing I&#x27;d like to see in guides like this would be some general advice about how to measure this kind of thing (e.g. browser dev tools) and, more importantly, how to avoid some of the common confounds like local caches when measuring using a tool like WebPageTest.org.