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What are the benefits over the built in pprof?

It's not at all a replacement. If you've used the built in pprof it's very detailed. All trees if you will.

Nitro provides the forest. Using this along with pprof helps narrow down where to focus your attention.

I've used it a bit and found top and -cum very useful. Nitro seems to combine memory and CPU(?) but besides that I don't understand the benefit.

Nitro seems quite nice.