Bun is a full fledged JavaScript runtime! Think node.js but fast
> Think node.js but fast
Color me extremely sceptical. Surely if you could make javascript fast google would have tried a decade ago....
Bun uses JSC (JavaScriptCore) instead of V8. From what I understand, whereas Node/V8 has a higher tier 4 "top speed", JSC is more optimized for memory and is faster to tier up early/less overhead. Good for serverless. Great for agents -> Anthropic purchase.
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The actual JS code is in the same ballpark as nodejs. They get fast by specializing to each platform's fastest APIs instead of using generic ones, reimplementing JS libraries in Zig (for example npm or jest) and using faster libraries (for example they use the oniguruma regex engine). Also you don't need an extra transpiling step when using TypeScript.
they have, v8 is a pretty fast engine and an engineering marvel. bun is faster at cost of having worse jit and less correctness