A browser speed test is a computer benchmark that scores the performance of a web browser, by measuring the browser's efficiency in completing a predefined list of tasks. In general the testing software is available online, located on a website, where different algorithms are loaded and performed in the browser client. Typical test tasks are rendering and animation, DOM transformations, string operations, mathematical calculations, sorting algorithms, graphic performance tests and memory instructions. Browser speed tests have been used during browser wars to prove superiority of specific web browsers. The popular Acid3 test is no particular speed test but checks browser conformity to web standards (though it checks whether a general performance goal is met). General tests Speedometer 2.0 Speedometer was originally developed by the WebKit team at Apple and released in 2014 and was updated in 2018. Speedometer 2.0 tests a browser's Web app responsiveness by timing simulated user interactions. This benchmark simulates user actions for adding, completing, and removing to-do items using multiple examples in TodoMVC. Each example in TodoMVC implements the same todo application using DOM APIs in different ways. Some call DOM APIs directly from ECMAScript 5 (ES5), ECMASCript 2015 (ES6), ES6 transpiled to ES5, and Elm transpiled to ES5. Others use one of eleven popular JavaScript frameworks: React, React with Redux, Ember.js, Backbone.js, AngularJS, (new) Angular, Vue.js, jQuery, Preact, Inferno, and Flight. Many of these frameworks are used on the most popular websites in the world, such as Facebook and Twitter. The performance of these types of operations depends on the speed of the DOM APIs, the JavaScript engine, CSS style resolution, layout, and other technologies. Peacekeeper Peacekeeper is a platform-independent benchmark by Futuremark that tests rendering, mathematical and memory operations. It takes approx. 5 minutes for execution and tells the results of other browsers with different CPUs. Futuremark stopped maintaining Peacekeeper in July 2015. The test was taken offline in March 2018 and is no longer available. Speed-Battle Test of a JavaScript engine using simple algorithms. It displays results of other visitors (best, average, poorest) with the same operating system and browser version. It has an additional statistics page with browser ranking. Testdrive Microsoft maintains a suite of performance-oriented tests, often designed to test and stress JavaScript and rendering performance. These tests are typically designed to highlight IE's performance, but are compatible with other major browsers. WebXPRT WebXPRT is a cross-platform browser benchmark that runs