The CPU is just sitting idle. It never peaks - eg I can sit there in console with vmstat and not see anything significant.
I'm using a power brick from an old Linksys modem - I forget what it's delivering, exactly, but it's right/above what the ALIX was designed for (I double checked when I started using it).
I don't have access to the modem. I've not been able to get into the interface yet, like I have been able to with different modems in the past.
Latency isn't really a "problem" - it's "normal" for what can be expected for around here, maybe even a little on the good side (30ms average for in-state type connectivity, 50-80ms for elsewhere).
Statistics on the WAN interface right now (9 day uptime - I have it scheduled to reboot twice a month on the 1st and 15th) are:
Media 100baseTX <full-duplex>In/out packets 67722571/67602120 (53.00 GB/46.54 GB)
In/out packets (pass) 67602020/67949144 (52.98 GB/46.54 GB)
In/out packets (block) 120551/100 (14.90 MB/7 KB)
In/out errors 0/0
Collisions 0
I've never seen an in/out error that I can recall.
I can ping eg. google.com all day without any packet loss and 60-65ms latency. Even with a larger packet size (eg ping -s 512 google.com) - I still have low enough jitter for VoIP to be usable.
54 byte packets:
–- google.com ping statistics ---
137 packets transmitted, 137 received, 0% packet loss, time 136181ms
rtt min/avg/max/mdev = 62.516/68.732/155.162/17.354 ms
512 byte packets:
--- google.com ping statistics ---
145 packets transmitted, 145 received, 0% packet loss, time 144199ms
rtt min/avg/max/mdev = 62.938/65.415/138.578/6.573 ms
(Ironically, the larger packets have a shorter round trip... which makes sense due to prioritization I suppose.)</full-duplex>