Optimization - sgml/signature GitHub Wiki

Code

       function init()
       {
            performance.mark("startTask1");
            doTask1(); // Some developer code
            performance.mark("endTask1");

            performance.mark("startTask2");
            doTask2(); // Some developer code
            performance.mark("endTask2");

            measurePerf();
       }

       function measurePerf()
       {
           var perfEntries = performance.getEntriesByType("mark");
           for (var i = 0; i < perfEntries.length; i++)
           {
                 if (window.console) console.log("Name: "        + perfEntries[i].name      +
                                                 " Entry Type: " + perfEntries[i].entryType +
                                                 " Start Time: " + perfEntries[i].startTime +
                                                 " Duration: "   + perfEntries[i].duration  + "\n");
           }
       }

       function loadResources()
       {
          var image1 = new Image();
          image1.onload = resourceTiming;
          image1.src = 'http://www.w3.org/Icons/w3c_main.png';
       }

       function resourceTiming()
       {
           var resourceList = window.performance.getEntriesByType("resource");
           for (i = 0; i < resourceList.length; i++)
           {
              if (resourceList[i].initiatorType == "img")
              {
                 alert("End to end resource fetch: "+ resourceList[i].responseEnd - resourceList[i].startTime);
              }
           }
       }