YSlow is a great tool - I've used it a lot. The main problem with using YSlow is it doesn't show performance trends over time. One of my goals for Slowcop is t

YSlow is a great tool - I've used it a lot. The main problem with using YSlow is it doesn't show performance trends over time. One of my goals for Slowcop is to give a dashboard where you can track performance across deploys. Also, there are a bunch of other tools and features I'm planning to add, like measurements from different regions and tools that track lower-level HTTP issues.