v8 features

// /tmp/perf-<pid>.map

1661472b3740 26 LoadIC:length
1661472b37e0 f4 LazyCompile:~exports.runInThisContext vm.js:52
1661472b3940 192 Stub:FastNewContextStub
1661472b3b40 61c Function:~ /Volumes/d/dev/talks/debugging-profiling-io.js/demos/demo-2/app.js:1
1661472b41c0 b4 Script:~/Volumes/d/dev/talks/debugging-profiling-io.js/demos/demo-2/app.js
1661472b42e0 9c LazyCompile:~require module.js:369
1661472b43e0 18c LazyCompile:~Module.require module.js:348
1661472b45e0 7c Stub:ToBooleanStub(Bool,String)
1661472b46c0 68 Stub:ToBooleanStub(Null,SpecObject)