the rPis of the era didn't have true gigabit ethernet, which I was using to drive cameras which saturated the link. The ethernet was via the USB 2 bus on them,

the rPis of the era didn't have true gigabit ethernet, which I was using to drive cameras which saturated the link. The ethernet was via the USB 2 bus on them, so limited to 480mbps in theory, but much less in practice. So the rPis didn't get any testing as they failed on paper before even getting there.