To add to other answers; issues I have run into relate to using the wrong DNS servers, causing sub-optimal content distribution servers being used. Make sure you are using DNS servers appropriate for the ISP connection you are using. To diagnose this further, I would use Chrome Developer Tools and the waterfall graph to determine exactly what is causing the slowdown. Is it the DNS response, the TCP setup, the TLS negotiation, the data transfer rate, or the coding of the website? https://stackoverflow.com/questions/42605476/how-to-use-networks-waterfall-in-chrome-dev-tool-to-diagnose-web-rendering-perf I'm assuming this isn't a WiFi or local access issue ...
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