I have exactly the same problem; any browser other than Edge either takes up to 5 minutes to load anything, or cannot load pages at all. Opera Turbo is off, as is VPN, ad-blocking etc. On Windows Pro 64 bit, build: 17134.rs4_release 18041-1804.
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RE: After 1803 and 1809 windows update opera dont load web pagesOpera for Windows