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The historic concurrency=3 was far too conservative for 1000+ node topologies. Raise them based on operation weight: stop_all: 3 -> 100 (docker kill + permissions cleanup, light) suspend_all: 3 -> 50 (docker pause/unpause, light) start_all: 3 -> 20 (ubridge startup + docker start + network, heavy) reset_console: 3 -> 20 (terminal reset, light) Node creation (open) already uses concurrency=100 and approaches the container-create daemon limit (~20/s); stop/kill is substantially faster than create, so 100 is safe.