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Asm.js is a highly optimized subset of JavaScript designed for performance-critical tasks, such as video games and other complex web applications. It was introduced by Mozilla as part of its Emscripten project to enable running existing codebases written in languages like C++ directly on the web without a plugin. By restricting JavaScript's dynamic behavior and using static types, Asm.js allows engines to pre-compile the code at load-time or during script parsing. This results in near-native execution speeds. Its primary purpose has been to serve as an intermediate representation that can be generated from source programs in statically-typed languages — particularly those compiled by projects like LLVM (Low-Level Virtual Machine). When run on browsers with Asm.js optimizations -- primarily versions of Firefox -- these applications can perform comparably to their desktop counterparts.

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