It looks to me like the profile viewer is actually speedscope ( https://www.speedscope.app/ https://www.speedscope.app/ ). I find it nicer for exploring profile

It looks to me like the profile viewer is actually speedscope ( https://www.speedscope.app/ https://www.speedscope.app/ ). I find it nicer for exploring profiles compared with Chrome's built-in viewer. To use with Node.js profiling, do the `node --inspect` and `chrome://inspect` steps, then save the profile as a .cpuprofile file and drag that file into speedscope. Another thing I've found useful is programmatically starting/stopping the profiler using `console.profile()` and `console.profileEnd()`.