response_ms was the whole `ping -c 1` process, or an open_connection awaited on the event loop: about 15 ms on a LAN whose round trip is under 1, and every host read slow together whenever Steward was busy. A ping now reports the round trip ping itself printed (the elapsed time only if it printed none); a TCP connect is timed in a thread, the name resolved first and not counted. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>