- In benchmark.uc and service_check.uc, pass -timeout=2 -type=a to nslookup - Prevents BusyBox nslookup from sending simultaneous A and AAAA queries across WAN, which causes a 2.5-second retransmit timeout bug on dual-stack/IPv4 routers - Reduces measured latency from ~2534ms down to true round-trip ping time (~8-15ms) - Cache tool lookups in has_tool() to avoid spawning redundant child processes