I prefer to work with a frontend engineer that knows a little bit about packet loss, routing, load balancing, white/black listing, retransmission, packet fragme

I prefer to work with a frontend engineer that knows a little bit about packet loss, routing, load balancing, white/black listing, retransmission, packet fragmentation, latency, mobile connections, socket limits, common error messages on network diagnostics, etc... that with an engineer that just knows "the page is slow". Well, indeed, the higher level protocols, like HTTP, DNS, etc, are more useful on a daily basis.