I personally like https://speed.cloudflare.com since it just looks like you're doing typical CloudFlare traffic. The results viewer is also quite nice.
Very cool! I never knew about this! I really appreciate the latency during upload test. I've bookmarked this and will stop using speedtest.net. Thank you!
Your isp likely has a Netflix oca or is directly peered with Netflix directly. It’s standard for any decent sized ISP since it’s either the largest or 2nd largest by volume peer (youtube being in the other).