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The (likely) problem here is that ROS uses peer-to-peer transport, so adding a second subscriber (the rosbag) doubles the number of bits that need to get pushed over your wireless link.

You can use a republish node to solve this; run it on machine #2, and then run the viewer and rosbag record on machine #2, but subscribed to the republish node, not the actual data topic. Then you move the bits over the wireless link once (machine #1 -> republish node), and then twice on the loopback interface (republish -> viewer and republish -> rosbag).