TL;DR: WebPagetest will now expose any User Timing marks that a page records so you can use the same custom events for your synthetic test measurement as well as your Real User Measurement (and you can use WebPagetest to validate your RUM measurement points). Before kicking off an optimization effort it is important to have good measurements in place. If you haven't already read Steve Souders' bl
![Measuring performance of the user experience](https://cdn-ak-scissors.b.st-hatena.com/image/square/34ca1329d2d2f39f776905bbd30059ec1c0ee6a9/height=288;version=1;width=512/https%3A%2F%2Fblogger.googleusercontent.com%2Fimg%2Fb%2FR29vZ2xl%2FAVvXsEgdfxwzSNkPPpLSVZjcevMC8rNkTetc0Tn_tCl3j3eZXafqgU-TGdpeWHUrcm3NaBLYaQwshiNRQCRHoaAtI2kKP_G1RU9K5ae2sZjnCVAeX6ABOPd8ySJ7BIDIME80Qh2sIJBajsG8vj0%2Fw1200-h630-p-k-no-nu%2Fresult-filmstrip-annotated.png)