as used in the Superhub 3
The surges in lag are experienced by subscribers on various big ISPs, from Comcast, Charter and Cox in the US to Rogers in Canada and Virgin Media in the UK. You don't need a full 1Gbps connection to trigger the latency spikes – just at least a super-fast package and a buggy modem.
The problem appears to be that the x86 CPU in the modem is taking on too much work while processing network packets. Every couple of seconds or so, a high-priority maintenance task runs and it winds up momentarily hogging the processor, causing latency to increase by at least 200ms and, over time, about six per cent of packets to be dropped. It affects IPv4 and IPv6 – and it spoils internet gaming and other online real-time interaction that need fast response times.