486/75 + 100Mbps NIC = CONFIG_CPU_IS_SLOW?

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I was setting up an old 486/75 with kernel v2.2.16 when the CONFIG_CPU_IS_SLOW
menu item caught my eye. As this pokey system has a 100Mbps NIC (a 3Com 3C574),
I have to wonder: how does one know if a given Ethernet device can outrun a
given CPU?

What symptoms would one see if the CPU was the bottleneck in network
communications?

Thanks.

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