It's an old bit of wisdom that's hard to stamp out. That's partly because anything that you don't understand below you in the runtime stack looks like "I/O" dur

It's an old bit of wisdom that's hard to stamp out. That's partly because anything that you don't understand below you in the runtime stack looks like "I/O" during profiling, so the misunderstanding perpetuates even among people who attempt to take a closer look, but don't know enough.