Performance tips

html {
  overflow-y: scroll;
}

performance.mark('start')
// some code we want to measure
performance.mark('end')

# assume there's an `add` function that is executed in benchmark.js

node --trace-opt benchmark.js | grep add
node --trace-opt --trace-deopt benchmark.js | grep add

# add %NeverOptimizeFuntion(add)
node --allow-natives-syntax benchmark.js