Latency and bandwidth are not completely unrelated. When you saturate the available bandwidth you simply cannot send more packets through the same channel so t

Latency and bandwidth are not completely unrelated. When you saturate the available bandwidth you simply cannot send more packets through the same channel so the only option is to queue (or drop and resend later), which means the packet will be delivered later. You seem to be describing a severe congestion at the ISP side due to your ISP not having enough bandwidth to handle their peak load. Surely, they could work smarter and selectively shape the traffic so that they drop the traffic you think is less important than yours but a) they may have crappy traffic shaping infrastructure b) they may not agree with your characterization of traffic priorities and they will rather not throttle video streaming or whatnot. EDIT: my point is that it's very hard to actually know what's the cause for the high latency unless you actually work for the ISP. Several causes can have the same observables