If you don't know what flame graphs are, check Brendan Gregg's post.
This repo was originally forked from spiermar/d3-flame-graph, but got completely rewritten to be more customizable and provide better performance and interactivity for large data sets.
npm pack && cp /Users/andreyp/Workplace/d3-flame-graph.git/dist/d3-flamegraph.* ~/Workplace/gotperformance.git/ardiff/external/d3-flamegraph