Benchmark: DOM modification getElementById pre-buffered vs direct

HTML Preparation code:

<div id="testElement"></div>

Script Preparation code:

var bufel = document.getElementById('testElement');

Tests:

getElementById buffered
bufel.innerHTML = "test";
getElementById unbuffered
var el = document.getElementById('testElement'); el.innerHTML = "test";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getElementById buffered
getElementById unbuffered

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and analyze the provided benchmark definition.

**What is tested:**

The benchmark measures the performance difference between two approaches to modify an HTML element's innerHTML property:

1. **Pre-buffered**: The `bufel` variable is assigned the result of `document.getElementById('testElement')` before the actual modification, which involves calling `innerHTML`.
2. **Direct**: The `var el = document.getElementById('testElement');\r\nel.innerHTML = \"test\";` approach directly assigns the modified value to the element without pre-buffering.

**Options compared:**

The two options are compared in terms of execution time, measured as `ExecutionsPerSecond`. This means that the benchmark will execute each test case multiple times and report the average number of executions per second for each option.

**Pros and Cons:**

1. **Pre-buffered (bufel)**:
	* Pros:
		+ Can improve performance by reducing the number of DOM queries.
		+ May be beneficial when working with large datasets or complex layouts.
	* Cons:
		+ Requires additional memory allocation for the pre-buffered variable.
		+ May not be suitable for scenarios where memory is limited.
2. **Direct**:
	* Pros:
		+ Does not require additional memory allocation.
		+ Can be beneficial when working with small datasets or simple layouts.
	* Cons:
		+ Requires an extra DOM query, which can be slower.

**Library and purpose:**

In the provided benchmark code, `bufel` is a variable assigned to the result of `document.getElementById('testElement')`. The `bufel` library is not explicitly mentioned, but it seems to be a custom or private variable used by the author. Without more context, it's difficult to determine its purpose.

**Special JS feature or syntax:**

The benchmark does not use any special JavaScript features or syntax that would require explanation beyond the standard ECMAScript syntax.

**Other alternatives:**

Alternative approaches could include:

1. **Using a caching library**: Instead of pre-buffering the element, using a caching library like LRU Cache or memoization techniques to store recently accessed elements.
2. **Using a virtual DOM**: Implementing a virtual DOM (e.g., React or Vue.js) to reduce the number of DOM queries and improve performance.
3. **Optimizing DOM queries**: Using techniques like query optimization, such as using `document.querySelector` instead of `document.getElementById`.
4. **Using async/await**: Writing asynchronous code using `async/await` to improve readability and performance.

Keep in mind that these alternatives may not be relevant to the specific benchmark being tested and might introduce additional complexity.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:108.0) Gecko/20100101 Firefox/108.0

Browser/OS: Firefox 108 on Windows

View result in a separate tab

Test name	Executions per second
getElementById buffered	2851948.8 Ops/sec
getElementById unbuffered	1922635.4 Ops/sec

Related benchmarks:

DOM modification getElementById pre-buffered vs direct (version: 0)

Comparing performance of: getElementById buffered vs getElementById unbuffered

Created: one year ago by: Guest

Jump to the latest result

getElementById buffered

getElementById unbuffered

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):