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WebBundles – JS Delivery Without the Tradeoffs

Delivering Javascript has inherent tradeoffs - large bundles result in better compression and lower processing overhead, but compromise caching granularity and execution parallelism. Wouldn't it be great if we wouldn't…

How to read a WebPageTest waterfall chart

WebPageTest (WPT) is the goto tool when it comes to analysing, and ultimately fixing web performance problems with a website. Much of the power of WPT comes from its waterfall…

LWP February: What’s new in HTTP


This February, we welcome two protocol experts to London Web Performance, to help us get up to date on our use of HTTP. Having got our heads around HTTP/2, and with it said goodbye to old practices like domain sharding and bundling, HTTP/3 is arriving to iron out the kinks in HTTP/2. It may be more of an under-the-hood update, but it’s worth understanding how this will impact your page load performance.

Meanwhile, HTTP headers have been a wild west of poor standardisation for years. Structured headers is arriving and will finally bring some order to the chaos, allowing a single parser to handle all compliant headers. Find out what structured headers will mean and take advantage by writing your custom headers using structured headers syntax.