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Why Nginx slow DNS Lookup, Initial Connection, SSL Negotiation on Mobile device only, not desktop

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I have a LEMP stack VPS (2GB RAM, 1 CPU, SSD, PHP8.0). This server runs several WordPress sites and uses a mobile-friendly responsive theme. Enabled FastCGI and uses http/2 push.

I have completely different results when testing on webpagetest.org; it shows terrible slow results for mobile devices.

What causes this slow response for mobile devices?

This is the webpagetest.org iPhone X chrome test result (4G mobile).

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This is the webpagetest.org Desktop Chrome result.

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