Author here.

I mainly used node's `--cpu-prof` flag to generate a profile. Tried loading the trace into Chrome DevTools at first, but wasn't able to load the file supposedly because they are too big. So I used https://www.speedscope.app/ instead and which loaded them without any issues and is very snappy overall. What's more is that it allows you to display a left-heavy flamegraph which makes it much easier to spot functions taking up a lot of time. Speedscope is an amazing tool!

For webpack based projects the traces were missing quite a bit of data and I had more luck with their own profiling plugin: https://webpack.js.org/plugins/profiling-plugin/