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Other browser vendors needed to overhaul their interpreters to compete. Apple developed the Nitro engine for its Safari browser, which had 30% better performance than its predecessor. Mozilla leveraged portions of Nitro to improve its own SpiderMonkey engine. Opera replaced its interpreter with the Carakan engine, which was twice as fast in some cases.
Since 2017, these browsers have added support for WebAssembly. This enables the use of pre-compiled executables for performance-critical portions of page scripts. The JS engines execute WebAssembly code in the same sandbox as regular JS code.
- Chrome V8 from Google is the most used engine. Google Chrome and the many other Chromium-based browsers use it, as do applications built with CEF, Electron, or any other framework that embeds Chromium. Other uses include the Node.js runtime system.
- SpiderMonkey is developed by Mozilla for use in Firefox and its forks. The GNOME Shell uses it for extension support.
- Chakra is the current engine of the Microsoft Edge browser, forked from the same-named engine of Internet Explorer. However, Microsoft is now rebuilding Edge as a Chromium-based browser, so it will be using V8 instead of Chakra. Internet Explorer continues to use its version of Chakra.
- Facebook created the Hermes engine to optimize Android apps that use the React Native framework.
- Shankland, Stephen (2008-09-02). "Speed test: Google Chrome beats Firefox, IE, Safari". CNET Business Tech. CBS Interactive. Retrieved 2010-06-28.
- "Big browser comparison test: Internet Explorer vs. Firefox, Opera, Safari and Chrome". PC Games Hardware. Computec Media AG. Retrieved 2010-06-28.
- "Lifehacker Speed Tests: Safari 4, Chrome 2". Lifehacker. Retrieved 2010-06-28.
- "Mozilla asks, 'Are we fast yet?'". Wired. Retrieved 18 January 2019.
- Safari 5 Released
- Stachowiak, Maciej (November 9, 2008). "Companies and Organizations that have contributed to WebKit". WebKit Wiki. Retrieved April 13, 2019.
- Belfiore, Joe (2018-12-06), Microsoft Edge: Making the web better through more open source collaboration, Microsoft
- "Microsoft Edge and Chromium Open Source: Our Intent". Microsoft Edge Team. 6 December 2018. Retrieved 8 December 2018.