Is my ISP blacklisting Cloudflare IPs?

When accessing the webpage via WIFI though Telekom Germany, my website is loading mega slowly. It takes minutes for anything to show up, while all other requests to other websites remain lighning fast.
When using my phone as a hotspot, though there are no access issues to my website.

Any suggestions on how to solve this issue?

Not blocking, but poor routing. There’s many threads on this for Telekom such as this one…

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