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This is a simple benchmark for several javascript frameworks. The benchmarks creates a large table with randomized entries and measures the time for various operations including rendering duration.


About the benchmarks

The following operations are benchmarked for each framework:

  • create rows: Duration for creating 1,000 rows after the page loaded (no warmup).
  • replace all rows: Duration for replacing all 1,000 rows of the table (with 5 warmup iterations).
  • partial update: Time to update the text of every 10th row for a table with 10,000 rows (with 5 warmup iterations).
  • select row: Duration to highlight a row in response to a click on the row. (with 5 warmup iterations).
  • swap rows: Time to swap 2 rows on a table with 1,000 rows. (with 5 warmup iterations).
  • remove row: Duration to remove a row for a table with 1,000 rows. (with 5 warmup iterations).
  • create many rows: Duration to create 10,000 rows (no warmup)
  • append rows to large table: Duration for adding 1,000 rows on a table of 10,000 rows (no warmup).
  • clear rows: Duration to clear the table filled with 10,000 rows. (no warmup)
  • ready memory: Memory usage after page load.
  • run memory: Memory usage after adding 1,000 rows.
  • update memory: Memory usage after clicking 5 times update for a table with 1,000 rows.
  • replace memory: Memory usage after clicking 5 times create 1,000 rows.
  • repeated clear memory: Memory usage after creating and clearing 1,000 rows for 5 times.
  • update memory: Memory usage after clicking 5 times update for a table with 1,000 rows.
  • startup time: Duration for loading and parsing the javascript code and rendering the page.
  • consistently interactive: The lighthouse metric TimeToConsistentlyInteractive: A pessimistic TTI - when the CPU and network are both definitely very idle. (no more CPU tasks over 50ms)
  • script bootup time: The lighthouse metric ScriptBootUpTtime: The total ms required to parse/compile/evaluate all the page's scripts
  • main thread work cost: The lighthouse metric MainThreadWorkCost: Total amount of time spent doing work on the main thread. includes style/layout/etc.
  • total byte weight: The lighthouse metric TotalByteWeight: Network transfer cost (post-compression) of all the resources loaded into the page.

For all benchmarks the duration is measured including rendering time. You can read some details on this article.

Official results

Official results are posted on the official results page. My blog has a few articles about about the benchmark. Older results of this benchmark are outlined on my blog (round 1, round 2, round 3, round 4, round 5, round 6, round 7 and round 8).

Snapshot of the results

The current snapshot that may not have the same quality (i.e. results might be for mixed browser versions, number of runs per benchmark may vary) can be seen here Results

1 NEW: Run pre-built binaries for all frameworks

There are currently ~60 framework entries in this repository. Installing (and maintaining) those can be challenging, but here are simplified instructions how to get started.

1.1 Prerequisites

Have node.js (>=v16.14.2) installed. If you want to do yourself a favour use nvm for that and install yarn. The benchmark has been tested with node vv16.14.2. Please make sure that the following command work before trying to build:

> npm
npm -version
> node --version

1.2 Downloading the pre-built binaries and starting the server

Builiding all frameworks can be challenging. There's a new way that allows to skip that and just run the benchmark without builiding all implementationss.

Start with checking out a tagged release like that. Pick the release that you want (e.g. chrome 100):

git clone
cd js-framework-benchmark
git checkout chrome100 -b release
npm ci && npm run install-local

Download the for that release from and put the into the js-framework-benchmark directory and unzip the prebuilt files:


You're now ready to start the http-server. Let the server run in the background

npm start

1.3 Running the benchmarks and handling errors

In a new console window you can now run the benchmarks:

npm run bench

This will take some time (currently about 12 hours on my machine). Finally create the results table:

npm run results

Open js-framework-benchmark/webdriver-ts-results/table.html in a browser and take a look at the results. You can open the result table with the link http://localhost:8080/webdriver-ts-results/table.html

Here's what you should do when the benchmark run was not sucessful. Let's assume the benchmark printed the following to the console:

The following benchmarks failed:
Executing frameworks/non-keyed/ef-js and benchmark 04_select1k failed: No paint event found
run was not completely sucessful Benchmarking failed with errors

You'll now have to run the benchmark again for those that failed like that:

npm run bench -- --framework non-keyed/ef-js --benchmark 04_

The you can then continue with creating the results table npm run results. Another workaround is to delete the folders of frameworks you can't run or you are not interested in.

2 The old and hard way: Building the frameworks and running the benchmark

2.1 Prerequisites

Have node.js (>=v16.14.2) installed. If you want to do yourself a favour use nvm for that and install yarn. The benchmark has been tested with node vv16.14.2. For some frameworks you'll also need java (>=8, e.g. openjdk-8-jre on ubuntu). Please make sure that the following command work before trying to build:

> npm
npm -version
> node --version
> echo %JAVA_HOME% / echo $JAVA_HOME
> java -version
java version "1.8.0_131" ...
> javac -version
javac 1.8.0_131

2.2 Start installing

As stated above building and running the benchmarks for all frameworks can be challenging, thus we start step by step...

Install global dependencies This installs just a few top level dependencies for the building the frameworks and a local web server.

npm ci

We start the local web server in the root directory

npm start

Verify that the local web server works: Try to open http://localhost:8080/index.html. If you see something like that you're on the right track: Index.html

Now open a new terminal window and keep the web server running in background.

2.3 Building and viewing a single framework

We now try to build the first framework. Go to the vanillajs reference implementation

cd frameworks/keyed/vanillajs

and install the dependencies

npm ci

and build the framework

npm run build-prod

There should be no build errors and we can open the framework in the browser: http://localhost:8080/frameworks/keyed/vanillajs/

Some frameworks like binding.scala or ember can't be opened that way, because they need a 'dist' or 'target/web/stage' or something in the URL. You can find out the correct URL in the index.html you've opened before or take a look whether there's a customURL property under js-framework-benchmark in the package.json that represents the url.

2.4 Running benchmarks for a single framework

The benchmark uses an automated benchmark driver using chromedriver to measure the duration for each operation using chrome's timeline. Here are the steps to run is for a single framework:

cd ../../..
cd webdriver-ts

and install the dependencies

npm ci

and build the benchmark driver

npm run compile

now run the benchmark driver for the vanillajs-keyed framework:

npm run bench keyed/vanillajs

Just lean back and watch chrome run the benchmarks. If it doesn't complain then the html for the table should be fine and your categorization as keyed or non-keyed should also be correct.

You should keep the chrome window visible since otherwise it seems like paint events can be skipped leading to wrong results. On the terminal will appear various log statements.

The results for that run will be saved in the webdriver-ts/results directory. We can take a look at the results of a single result:

cat results/vanillajs-keyed_01_run1k.json

As you can see the mean duration for create 1000 rows was 144 msecs.

You can also check whether the implementation appears to be compliant to the rules:

npm run isKeyed keyed/vanillajs

If it finds anything it'll report an ERROR.

2.5 Building the result table

Install libraries:

cd ..
cd webdriver-ts-results
npm ci
cd ..
cd webdriver-ts

In the webdriver-ts directory issue the following command:

npm run results

Now a result table should have been created which can be opened on http://localhost:8080/webdriver-ts-results/table.html. There's nothing in table except for the column vanillajs-keyed at the right end of the first table. First Run Results

2.6 [Optional] Updating the index.html file

This simply rebuilds the file used to display the table, not the results.

npm run index

2.7 [Optional] Building and running the benchmarks for all frameworks

This is not for the faint at heart. You can build all frameworks simply by issuing:

cd ..
npm run build-prod

After downloading the whole internet it starts building it. Basically there should be no errors during the build, but I can't guarantee that the dependencies won't break. (There's a docker build on the way which might make building it more robust. See

You can now run the benchmark for all frameworks by invoking:

npm run bench-all

in the root directory.

After that you can check all results in http://localhost:8080/webdriver-ts/table.html.

3 Tips and tricks

  • You can run multiple implementations by passing their directory names (cd to webdriver-ts): npm run bench keyed/angular keyed/react.
  • You can select multiple frameworks and benchmarks for running with prefixes like in the following example in the webdriver-ts directory: npm run bench -- --benchmark 01_ 02_ --framework keyed/vanillajs keyed/react-hooks runs the test for all frameworks that contain either angular or bob, which means all angular versions and bobril and all benchmarks whose id contain 01* or 02*
  • The memory benchmarks assume certain paths for the chrome installation. If it doesn't fit use npm run bench -- --chromeBinary /usr/bin/google-chrome
  • If you can't get one framework to compile or run, just move it out of the frameworks directory and re-run
  • One can check whether an implementation is keyed or non-keyed via npm run isKeyed in the webdriver-ts directory. You can limit which frameworks to check in the same way as the webdriver test runner like e.g. npm run isKeyed keyed/svelte. The program will report an error if a benchmark implementation is incorrectly classified.

4. Contributing a new implementation

4.1 Building the app

For contributions it is basically sufficient to create a new directory for your framework that supports npm install and npm run build-prod and can be then opened in the browser. All other steps are optional. Let's simulate that by copying vanillajs.

cd ../frameworks/keyed
cp -r vanillajs super-vanillajs
cd super-vanillajs

Then we edit super-vanillajs/index.html to have a correct index.html:


In most cases you'll need npm install and npm run build-prod and then check whether it works in the browser on http://localhost:8080/frameworks/keyed/super-vanillajs/.

(Of course in reality you'd rather throw out the javascript source files and use your framework there instead of only changing the html file.)

4.2 Adding your new implementation to the results table.

(Notice: Updating common.ts is no longer necessary, super-vanillajs is visible in the result table)

Your package.json must include some information for the benchmark. Since you copied it, the important section is already there:

  "js-framework-benchmark": {
    "frameworkVersion": ""

This one is a bit exceptional since vanillajs has no version. If you use a normal framework like react it carries a version information. For most frameworks you'll add a dependency to your framework in package.json. The benchmark can automatically determine the correct version information from package.json and package-lock.json if you specify the package name like that:

  "js-framework-benchmark": {
    "frameworkVersionFromPackage": "react"

Now the benchmark will fetch the installed react version from package-lock.json in the react directory and use that version number to compute the correct version string. If your library has multiple important packages like react + redux you can put them separated with a colon there like "react:redux". If you don't pull your framework from npm you can hardcode a version like "frameworkVersion": "0.0.1". The other important, but optional properties for js-framework-benchmark are shown in the following example:

"customURL": "/target/web/stage",
"useShadowRoot": true

You can set an optional different URL if needed or specify that your DOM uses a shadow root.

4.3 Submitting your implementation

Contributions are very welcome. Please use the following rules:

  • Name your directory frameworks/[keyed|non-keyed]/[FrameworkName]
  • Each contribution must be buildable by npm install and npm run build-prod command in the directory. What build-prod does is up to you. Often there's an npm run build-dev that creates a development build
  • Every implementation must use bootstrap provided in the root css directory.
  • All npm dependencies should be installed locally (i.e. listed in your package.json). Http-server or other local web servers should not be local dependencies. It is installed from the root directory to allow access to bootstrap.
  • Please use fixed version numbers, no ranges, in package.json. Otherwise the build will break sooner or later - believe me. Updating works IMO best with npm-check-updates, which keeps the version format.
  • Webdriver-ts must be able to run the perf tests for the contribution. This means that all buttons (like "Create 1,000 rows") must have the correct id e.g. like in vanillajs. Using shadow DOM is a real pain for webdriver. The closer you can get to polymer the higher the chances I can make that contribution work.
  • Don't change the ids in the index.html, since the automated benchmarking relies on those ids.
  • Please push only files in your framework folder (not index.html or results.json)
  • Please make sure your implementation is validated by the test tool. cd to webdriver-ts and invoke it with npm run isKeyed [keyed|non-keyed]/[FrameworkName]. It'll print an error if your framework behaves other as specified. It'll print a big ERROR explaining if it isn't happy with the implementation. Some common errors include:
    • Your package.json is missing some required fields
    • Incorrect classification (Keyed/NonKeyed)
    • You have gzipped files in /dist (unfortunately the web server prefers these when they exist)
  • Please don't commit any of the result file webdriver-ts/table.html, webdriver-ts-results/src/results.ts or webdriver-ts-results/table.html. I use to run the benchmarks after merging and publish updated (temporary) results.
  • The latest stable chrome can be used regarding web features and language level (babel-preset-env "last 1 chrome versions")
  • The vanillajs implementations and some others include code that try to approximate the repaint duration through javascript code. Implementations are not required to include that measurement. Remember: The real measurements are taken by the automated test driver by examining chrome timeline entries.
  • Please don't over-optimize. This benchmark is most useful if you apply an idiomatic style for the framework you're using. We've sharpened the rules what kind of implementation is considered correct and will add errors or notes when an implementations handles things wrongly (errors) or in a way that looks like a shortcut (notes).
    • The html must be identical with the one created by the reference implementation vanillajs. It also must include all the aria-hidden attributes. Otherwise the implementation is considered erroneous and will be marked with issue #634.
    • Keyed implementations must pass the npm run isKeyed test in the test driver otherwise they are erroneous. Not that this test might not be sufficient, but just necessary to be keyed (from time to time we find new loop holes). There's error #694 for such cases.
    • Using request animation frame calls in client code, especially when applied only for some benchmark operations, is considered bad style and gets note #796 applied. Note that frameworks are free to choose whether they use RAF of not.
    • Manual DOM manipulation (like setting the danger class directly on the selected row) lead to some controversial debates. Depending on the framework you're using it might be idiomatic style or not. In any case it gets note #772 applied.
    • Implementations should keep the selected rows in the state (i.e. not a flag for each row, but one reference, id or index for the table) and use that information for rendering. Keeping a selection flag for each row might be faster, but it's considered bad style. Thus those implementations get note #800.
    • Explicit event delegation is another area where many discussions came up. Implementations that use explicit event delegation in client code get note #801. Frameworks themselves are free to use event delegation.

Helpful tips:

  • Do not start your implementation using vanillajs as the reference. It uses direct DOM manipulation (and thus has note #772) and serves only as a performance baseline but not as a best practice implementation. Instead pick a framework which is similar to yours.
  • Do not forget to preload the glyphicon by adding this somewhere in your HTML: <span class="preloadicon glyphicon glyphicon-remove" aria-hidden="true"></span> or you will get terrible performance.
  • Be careful not to leave gzipped files in your /dist directory. Unfortunately the web server prefers these when they exist and we cannot change that (meaning you could be observing an outdated build).

This work is derived from a benchmark that Richard Ayotte published on and adds more framework and more operations. Thanks for the great work.

Thanks to Baptiste Augrain for making the benchmarks more sophisticated and adding frameworks.


Frameworks without significant activity on github or npm for more than a year will be removed (automatic commits like dependabot and minor updates, like docs editions, are ignored).

Will be removed in future:

  • crui Last significant commit Jul 28, 2019


  • etch Last commit Sep 12, 2018
  • hyperoop Last significant commit Dec 23, 2018
  • faster-dom (to be replaced by a new revact implementation)
  • plastiq (to be replaced by a new Hyperdom implementation)
  • rawact Last commit Dec 3, 2018
  • react-djinn Last NPM publish 2019-05-03 (the Github org a repo aren't available anymore)
  • react-lite Last commit Mar 29, 2019
  • redux-combiner Last commit May 14, 2018
  • surplus Last commit Jan 5, 2019
  • gruu Last commit Jun 23, 2019
  • lite-html Last commit Sep 7, 2018


  • angular-light Last commit Nov 30, 2017
  • nx. Last commit Feb 2017
  • maik-h Last commit Dec 15, 2017
  • rivets Last commit Oct 22, 2016
  • tsers. Last commit Jun 19, 2016