ALT Bun v1.4 URL, Headers & URLSearchParams — operations per second, longer is faster Bun v1.4 Bun v1.3.14 Node v26 9.62M ops/s 4.6x faster than v1.3.14 new URL (url) "https://example.com/search?q=bun#results" 2.10M ops/s 3.51M ops/s 4.37M ops/s 3.6x faster than v1.3.14 new URL (path, base) "../assets/logo.svg" against a page URL 1.22M ops/s 1.93M ops/s 4.15M ops/s 18.4x faster than v1.3.14 new URL (LongUrl) 2 KB of query string 225K ops/s 641K ops/s 10.1M ops/s 5.1x faster than v1.3.14 URL. parse (url) 1.97M ops/s 1.92M ops/s 2.48M ops/s 1.6x faster than v1.3.14 new Headers({...}) 3 headers from an object 1.60M ops/s 610K ops/s 2.17M ops/s 1.4x faster than v1.3.14 new URLSearchParams ({...}) 5 params from an object Linux x64 • same machine • mitata • bars scaled per benchmark 1.55M ops/s 1.66M ops/s bench/snippets/{url-kinds,headers, urlsearchparams}.mjs

ALT Effect v4 Release Candidate banner. A horizontal timeline shows 3.0 stable on the left, 4.0 RC in the center marked “we are here,” and 4.0 stable on the right.

ALT Dark benchmark card titled "RegExp in Bun". Top right, struck through: the GitHub issue title "Node.js is 300× faster than Bun at isbot regexp" (oven-sh/bun#5197, closed). Huge headline: "281× faster on the isbot regex." Subtext: "110 alternatives, four lookbehinds, 263,487 real user-agent strings. Same script, same machine." Three horizontal bars, drawn to scale, lower is better: Bun v1.3.14 (before) 32,395 ms — spans the full width; Node.js v26 (V8/Irregexp) 141 ms — a thin sliver; Bun v1.4 (after) 115 ms — an even thinner pink sliver. Footer: Apple Silicon, benchmark from github.com/quick-lint/bun-vs-node; improvements: JIT-compiled lookbehinds, alternation dispatch, prefix factoring, wider Boyer-Moore search. The isbot regex source is faintly visible as background texture.