On another thread were I said I don't like build tools/compilers in the same language as they work on, when the language is slow, I got voted down.

Here everyone: JS build tool in Go? Great!

+1 for parallelism of esbuild. I have a12 core machine and many tools either use one core or when forced to not benefit from more cores.

I also wish they would waste more memory, I have 32gb which re mostly unused even by large projects.

I stand by my opinion: dev tools should make it pleasant for developers not the tool writers.