On a system with 20,000 ppp network interfaces, netstat -ni takes more than 5 minutes to complete due to O(n^2) behaviour. What strace shows is that netstat is continually rereading /proc/net/dev to pick out the information about the next interface.
I can't really reproduce it here but you're right, netcat opens /proc/net/dev for every statistics. That's expected behavior.
Uhm, if you need a script to reproduce it that can be provided, but closing it as CANTFIX doesn't resolve anything.
A script would help for sure. But I still lack 20.000 ppp interfaces ..
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