Benchmark: insertAdjacentHTML vs appendChild 2025

HTML Preparation code:

<div id="test"></div>

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

AppendChild
const aboutDiv = document.createDocumentFragment(); const newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { const newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.appendChild(newElementPart); } aboutDiv.appendChild(newElement); document.getElementById("test").appendChild(aboutDiv);
insertAdjacentHTML
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; document.getElementById("test").insertAdjacentHTML("beforeend", html);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
AppendChild
insertAdjacentHTML

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser/OS: Firefox 141 on Windows

View result in a separate tab

Test name	Executions per second
AppendChild	388.3 Ops/sec
insertAdjacentHTML	911.0 Ops/sec

Related benchmarks:

insertAdjacentHTML vs appendChild 2025 (version: 1)

Comparing performance of: AppendChild vs insertAdjacentHTML

Created: 10 months ago by: Guest

Jump to the latest result

AppendChild

insertAdjacentHTML

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A