Network Lag With Multiple Camera Robot

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We have five robots, all publishing on-board camera feeds. Camera is publishing at 1 FPS but with all five on network the lag is well over 5 seconds and the data rate shown in RQT topic monitor is only ~.2-.3 Hz.

Any thoughts on the bottleneck? Using ethernet instead of wireless improved things, as expected, but still did not reach 1 Hz rate as expected.

We have not seen this behavior with data.