When would you choose NOT to use Julia for a high-performance system?

You avoid Julia when deterministic latency, minimal runtime, or strict deployment constraints outweigh its productivity and performance benefits.

Julia is excellent for numerical computing, but not ideal when you need hard real-time guarantees, ultra-small static binaries, or environments where JIT compilation is forbidden. Systems like embedded firmware, kernel modules, or ultra-low-latency trading cores may favor C/C++ or Rust due to predictable compile-time behavior and zero runtime compilation overhead.