v8-profiler provides node bindings for the v8 profiler and integration with node-inspector
npm install v8-profiler
var profiler = require('v8-profiler');
var snapshot = profiler.takeSnapshot([name]) //takes a heap snapshot
profiler.startProfiling([name]) //begin cpu profiling
var cpuProfile = profiler.stopProfiling([name]) //finish cpu profiling
Cpu profiles can be viewed and heap snapshots may be taken and viewed from the profiles panel.