Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0
Firefox 88
Windows
Desktop
3 years ago
Test name Executions per second
createElement 449.0 Ops/sec
insertAdjacentHTML 827.8 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="test"></div>
Tests:
  • createElement

     
    newElement = document.createElement("div");
    newElement.id = "testing"
    for (i = 0; i < 1000; i++) {
      let newElementPart = document.createElement("div");
      newElementPart.classList.add("testClass");
      newElement.append(newElementPart);
    }
    document.getElementById("test").append(newElement);
  • insertAdjacentHTML

     
    html = "<div id='testing'>"
    for (i = 0; i < 1000; i++) {
      html += "<div class='testClass'></div>";
    }
    html += "</div>";
    document.getElementById("test").insertAdjacentHTML("beforeend", html);