New field browser performance and profiling tooling - rumcap

Ever since browser vendors started exposing advanced performance telemetry APIs directly to the page, like the Performance Timeline , Long Animation Frames (LoAF) , and the JS Self-Profiling API , I've been waiting for tooling that could capture, store, and visualize all of this data in the wild. We can gather incredibly detailed information about what is happening on a user's machine, but…