In the next version of Bun Enabling profile-guided optimization for bytecode improves startup time by up to 2x `bun build --compile --bytecode --bytecode-order=./file`

See the "profile guided bytecode layout" section of the docs

I can't believe 3 is less than 12 This is clearly a psyop

the order file is a lockfile for startup: pinned to the trace you profiled, quietly stale as code paths change. regenerate it per release, or the 2x decays with nothing failing.

So even vibe coder will understand – probably...

Video is hilarious 😂 but interesting improvements

make @claudeai code faster already

bytecode startup up to 2x tho. yeah I'll take that

Does that profile stay valid if the workload shape changes later?

Hit this with a build script last month. Tight, predictable startup paths captured most of the gain, but anything with dynamic requires at boot barely moved. Does the --bytecode-order profile account for that, or is the 2x mostly on linear startup paths?

🤓

but, does it have electrolytes? 👀

This is funny 🤣

That's a lot of megabytes!

why is this not default?

The team is getting good with the explanation videos 🔥