Yes.
iPhone 12 lineup suffers an excessive (and too aggressive) thermal throttling.
This is a problem.
Astrubalese
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I noticed this too.
iPhone 12 slows down drastically when heating (like in games or something heavy like that) but is excessive.
Same problem here with iPhone 12.
The same games that I used in iPhone 11 had no problems there, but on the new 12 I see a lot of slowdowns.
Same problem here with iPhone 12.
On iPhone 11 I had no problems and now, with the same games and app, I have these serious throttling and slow down problems.
The A14 should be more powerful and efficient, so this is a problem and I think a software problem, specifically iOS maybe.