[supertrope]

The bottleneck is at your ISP's CMTS or DSLAM and your modem. e.g. The DSLAM has 1 Gbps in and only 40 Mbps down the line to your VDSL modem. Or your cable modem has access to 600 Mbps of capacity but your plan is only 100 Mbps so the modem limits. So there's quick stepdown: 1 Gbps, 600 Mbps, 100 Mbps.

[floatboth]

Yeah, the stepdown is on the ISP side, how would it affect buffers of my consumer router?

[supertrope]

For downloads it's buffers in your ISP's hardware that matter. For uploads it's your router's egress buffer.

e.g. You are syncing gigabytes to Dropbox. A poorly designed router will continue to accept packets far past upstream capacity. Now that's there's 2000 ms of bulk traffic in the router's queue, any real time traffic has to wait a minimum of 2 seconds before getting out.

[floatboth]

Yeah, exactly. I mean, in your original comment you talked about bufferbloat on crappy consumer hardware and the example was a big download :)