Speedtest uses HTTP 1.1 only?

[heftig]

I took a look at Firefox's developer tools network tab while the speed test was running, and I noticed all the requests were being done over HTTP 1.1, even though I had HTTP 3 and HTTP 2 enabled.

When disabling both HTTP 3 and HTTP 2 in Firefox so it only uses HTTP 1.1, most of my issues browsing and downloading from other CloudFlare-hosted sites disappear. For me, transfers suffer most when transferred over HTTP 3, which is enabled by default. HTTP 2 is less affected and HTTP 1.1 feels fine.

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I copied this from AKVorrat/Netzbremse.de#12, but I can see https://speed.cloudflare.com behave identically, with all __down requests (and other requests to speed.cloudflare.com) only using HTTP/1.1.

The speed test regularly (but not always) saturates my connection (Deutsche Telekom, AS3320), only rarely dipping into the low Mbps, while CloudFlare-fronted sites using HTTP/3 or HTTP/2 often crawl at sub-megabit speeds.

[heftig]

Apparently CloudFlare does have a HTTP/3 speedtest, but only at https://h3.speed.cloudflare.com/. This shows Düsseldorf (DUS) as the server here, which seems to be fine speed-wise. (Firefox gets abysmal latency in this test but Chrome is fine.)

I noticed the hosts used by Netzbremse (custom-t*) all use Frankfurt (FRA) as the server.

The sites I have trouble on get served from outside of Germany, for some reason, at least according to their CF-RAY headers. It used to be Newark (EWR) but currently they're served from London (LHR).

Perhaps this is a CloudFlare tier thing, with customers paying more getting to be served from servers that have transit to AS3320? Unfortunately this includes the speed tests.