HwKeeper
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I currently have Beeline and MTS, both on computer and phone, and the forum loads exactly this much (Moscow). Nothing below the sixth section — no luck. The issue is clearly with the providers; on home Wi-Fi everything works fine.
I suspect that many of the problems reported in this thread are related to local blocks or their direct consequences in different countries.
https://loading.express/?test_id=685abdccf8e26e3e56660baa&server=main
Google PageSpeed loaded the page fully in 3.9 seconds.
The full-size desktop version loaded even faster per PageSpeed, in 1.4 seconds.