Comment by cesarvarela
Comment by cesarvarela 17 hours ago
I've found it to be at least twice as fast with practically no compat issues.
Comment by cesarvarela 17 hours ago
I've found it to be at least twice as fast with practically no compat issues.
You might want to revise what you consider to be "absolutely zero chance". Bun has an insanely fast startup time, so it definitely can be true for small workloads. A classic example of this was on Bun's website for a while[1] - it was "Running 266 React SSR tests faster than Jest can print its version number".
johnfn@mac ~ % time deno eval 'console.log("hello world")'
hello world
deno eval 'console.log("hello world")' 0.04s user 0.02s system 87% cpu 0.074 total
johnfn@mac ~ % time bun -e 'console.log("hello world")'
hello world
bun -e 'console.log("hello world")' 0.01s user 0.00s system 84% cpu 0.013 total
Keep in mind that it's not just a matter of comparing the JS engine. The runtime that is built around the engine can have a far greater impact on performance than the choice of v8 vs. JSC vs. anything else. In many microbenchmarks, Bun routinely outperforms Node.js and Deno in most tasks by a wide margin.
The claim I responded to is that Bun is "at least twice as fast" as Deno. This sounds a lot more general than Bun being twice as fast in cherry-picked microbenchmarks. I wasn't able to find any benchmark that found meaningful differences between the two runtimes for real-world workloads. (Example: https://hackernoon.com/myth-vs-reality-real-world-runtime-pe...)
Twice as fast at executing JavaScript? There's absolutely zero chance this is true. A JavaScript engine that's twice as fast as V8 in general doesn't exist. There may be 5 or 10 percent difference, but nothing really meaningful.