We have the same issue, confirmed with users from FRA and DME colos. Turning off HTTP 3 / QUIC on Cloudflare resolved the issue, but it means all our users are now downgraded to H2.
This has finally helped me! I live in Germany and I can absolutely confirm that everything behind the Cloudflare proxy was absolutely unusable. I am very surprised that this company has not fixed this problem by now. It looks like Cloudflare is no longer a guarantee that your site will be fast, but the opposite is true!
I myself only use Cloudflare for hobbies, but I have often recommended it to larger companies as a consultant. I certainly won’t be doing that anymore.
It might be important to mention, that this issue with HTTP 3 only appears for me with Chrome. With Firefox i haven experienced any slow load times.
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Encountered this error too, I’m in Germany as well.
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