The problem with old ifconfig was really visible, old ifconfig needed several
minutes to setup. It was slow enough that "visual benchmarking" worked very well.
With the fixed ifconfig it scrolls without too annoying delays.
The ifconfig could be tuned even more by adding a hash table, but it didn't look
necessary (and frankly nobody wants to invest too much work into it, given
that ip is far superior)
Note that the alias case is different from thousands of devices -- alias works
via SIOCGIFCONF while devices work via /proc/net/dev.
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