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No.

The master is the integral part of any ROS system, orchestrating all connections (Pub/Sub, Service, Action), so this is required for a ROS node to run.

That being said, I don't understand your use case. How does "start-up time" increase when you have to start the master first? And if not, how would you benefit from first starting the nodes (then not being able to anything at all, at least from the ROS side) and then connecting to a master once it is available? This would just move any latency in connecting to the master from "when the node starts" to "when the master starts"...