I was also suspecting that Comcast throttled Netflix, because Netflix would say something like 45 minutes to start a movie, while speedtest was reporting 4-5 megabits per second.
Netflix to throttle streaming during coronavirus crisis Mar 19, 2020 How Does Netflix on Xfinity® X1 affect Internet Data Usage Learn how Netflix on Xfinity X1 affects Internet Data Usage.
Comcast Customer Service - Xfinity® Technical Support
Feb 19, 2014 Comcast vs. Netflix: Is this really about Net neutrality Netflix’s disputes with broadband providers, like Comcast, have zip to do with Net neutrality. Here's what you need to know about Net neutrality, and the Internet, to understand why.
Netflix launched this handy speed test so you can go shame
Netflix Comcast deal targets throttling | CBC News