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Thanks for checking out Big Rig.

Big Rig exists to try and give you extended information on what your page was doing during critical RAIL actions, in particular Loading, Responding and Animating. So, for example, it can help you answer questions like: how much time did I spend in JavaScript during page load, and of the time in JavaScript, whose script in particular was the longest-running? Or, during a scroll of my site, what was the fps and how much time did I spend in styles, layout, paint, and composite during each frame?

Take a look at the FAQ, file issues if you find them, and let us know how you get on.