Are you running Chrome? It's a resource hog. Firefox isn't much better.
I'm running brave for the built in adblocker, I think it's chromium based, but as I said nothing else does this to my phone, usually when it warms up It's the battery warming up but with poal its the area around my cameras at the top of the phone.
It's warm in 2 or 3 minutes and absolutely hot in maybe 6 or 7.
I'd try changing browsers, switching to desktop view and also watch power consumption of the browser.
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