Performance API notes

performanceAPI.js

performance.mark("startFoo");
// A time consuming function
foo();
performance.mark("endFoo");

performance.measure("durationFoo", "startFoo", "endFoo");

// Delete all Marks
performance.clearMarks();
// Delete the Measure "durationFoo"
performance.clearMeasure("durationFoo");

window.performance.clearMeasures('measure_load_from_dom');

var items = window.performance.getEntriesByType('mark');
var items = window.performance.getEntriesByType('measure');
var items = window.performance.getEntriesByName('mark_fully_loaded');