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when numbers of machines use the same master,the running speed is very slow

when I let numbers of machines use the same master,the running speed is very slow. such as I have three computers A B and C. Then I running the roscore in the C, let the A and B use the the master in the c at the same time.I found the speed of public and subscribe topics is very slow, so as the services. I don't why and how to solve the problem. if sameone knows please tell me. thank you very much.