> The bun team tried to parallelize Zig's semantic analysis a while back - and it DID compile about 4x as fast...

I actually collected a build with multi-threading turned on [1]. It helped quite a bit, cutting the Zig object time from 7m49s to 4m05s. But because of the reason you mentioned (and the post was already so long!) I decided not to bring it up.

> Oh - one last thing to note, Zig has very fast debug compilation and incremental compilation, it's a real nice thing to work with that you simply can't approach in most other languages right now.

Yes, in fact I also tested just running bun run build / bun run build:release and captured traces for both! The clean release build took 3m36s for Zig versus 5m50s for Rust [2][3]. Clean debug was closer: 3m07s versus 3m27s [4][5].

I also tried incremental debug builds: adding a comment to output.zig / output.rs took 48.6s / 65.4s to rebuild. Ordinary developer builds certainly gave a different picture from CI.

[1] https://buildprof.lalitm.com/#!/?url=https%3A%2F%2Fblogexamp...

[2] https://buildprof.lalitm.com/#!/?url=https%3A%2F%2Fblogexamp...

[3] https://buildprof.lalitm.com/#!/?url=https%3A%2F%2Fblogexamp...

[4] https://buildprof.lalitm.com/#!/?url=https%3A%2F%2Fblogexamp...

[5] https://buildprof.lalitm.com/#!/?url=https%3A%2F%2Fblogexamp...

I made a build visualizer to understand Bun's compile times