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Instances of these types are immutable and in optimized code are mapped directly to SIMD registers. Operations expressed in Dart typically are compiled into a single instruction without any overhead. This is similar to C and C++ intrinsics. Benchmarks for [[4×4 matrix|4×4]] [[matrix multiplication]], [[3D vertex transformation]], and [[Mandelbrot set]] visualization show near 400% speedup compared to scalar code written in Dart.
Intel announced at IDF 2013 that they were implementing McCutchan's specification for both [[V8 (JavaScript engine)|V8]] and [[SpiderMonkey (JavaScript engine)|SpiderMonkey]].<ref>{{cite web |title=SIMD in JavaScript |url=https://01.org/node/1495 |website=01.org |date=8 May 2014}}</ref> However, by 2017, SIMD.js was taken out of the ECMAScript standard queue in favor of pursuing a similar interface in [[WebAssembly]].<ref>{{cite web |title=tc39/ecmascript_simd: SIMD numeric type for EcmaScript. |url=https://github.com/tc39/ecmascript_simd/ |website=GitHub |publisher=Ecma TC39 |access-date=8 September 2019 |date=22 August 2019}}</ref> Support for SIMD was added to the WebAssembly 2.0 specification, which was finished on 2022 and became official on December 2024.<ref>{{cite web | url=https://webassembly.org/news/2025-03-20-wasm-2.0/ | title=Wasm 2.0 Completed - WebAssembly }}</ref>
LLVM supports auto-vectorization of programs to automatically make use of SIMD, while SIMD intrinsic are also available.<ref>{{cite web |title=Using SIMD with WebAssembly |url=https://emscripten.org/docs/porting/simd.html |website=Emscripten 4.0.11-git (dev) documentation}}</ref>
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