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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…

How PerfOps revolutionized performance at Marks & Spencer

This month we have a great talk from Andrew Neilson who is currently head of PerfOps at Marks and Spencer and is responsible for performance across the breadth of the M& business. The talk was first given at Velocity Europe last Autumn, and was extremely highly rated, but even if you attended that talk, Andrew promises an interesting update as things have moved on considerably in the last 6 months. This talk will demonstrate how a large business such as M&S can move from a standing start to having a performance culture. One not to miss.