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Except for the possibility that your communication channel isn't suited for such large data transport (as mentioned by William) it's perfectly possible to run some nodes on an external machine. You can distribute this from one launch file by using the machine tags. It helps to have your SSH-keys set-up correctly. You can find an example of such a file in our AR_pose_demo package. In the ar_pose_kb_double_distri launch file, I'm launching camera's with connected image processing over different computers and only the results are streamed over the Wifi channel.