Modal explains why sandbox "started" ≠ "ready" and how warm pools cut perceived startup latency

Modal argues that container scheduling and boot time, which most sandbox benchmarks measure as time to interactive, is the smallest part of what users actually wait through; application-level setup after the container starts often takes multiple seconds. Modal is making Readiness Probes generally available to signal when a sandbox has finished initializing, and recommends warm sandbox pools built on modal.Queue plus Directory Snapshots to move setup off the user's critical path.