It's like Electric Insight, which was a fantastic if proprietary tool.

There's an enormous amount of analysis you can do with tools like this from estimating how much faster the build would be with more cores (i.e. is it worth adding more) to things like a diff of one build against another: why is one build bad and the other good - what tasks had different parameters or weren't in both builds?

Diffing is something I definitely want to support. I've filed https://github.com/LalitMaganti/buildprof/issues/12 to add support for this, I have ideas!