The most highly entertaining description, explanation, analysis, and demo
of cwnd issues and web traffic and congestion that I've ever read:

https://insouciant.org/tech/network-congestion-and-web-browsing/

I didn't know cloudshark had come so far, either.

-- 
Dave Täht

Fixing bufferbloat with cerowrt:
http://www.teklibre.com/cerowrt/subscribe.html