After applying the last update iOS 17.0.3 the heating issues seems to be resolved.
The iphone I have is an 15 Pro Max 512 GB black titanium and it does not overheat anymore...
Several tests were completed:
1) Charging with iphone original 20W charger and with a non apple cable - different USB-C to USB-C cable was used.
The phone is really cold when charging... I was surprised!
2) Tested to play youtube vide (high resolution) for approx. 45 min and the phone does not heat at all.
During this test I also tested to charge the phone while playing the video for 10-15 m and the results was the same, the phone does not overheat.
3) Filmed with the phone 4K @60fps my playing game on the laptop for 28 minutes.
Recording at 4K, 3840*2160 = 9GB video file size.
The phone is not very hot, you can feel the heat but is not even comparable how it was before the update.
4) The Geekbench 6 tested were executed several times (one after the other)
The tests for executed for 4, 5, 6 times in a row and the phone remains with very good temperature.
Of course you can feel the heat but only after the 4-5 time when the test run and is very cold comparared with how hot it was before the update.
Also the results of the tests are higher or at least the same with the previous tests that were executed before the latest update.
Geekbench 6 - test results:
1) Test results before the patch was applied (tested before on 25th and 28th-September-2023):
2930/7281 ; 2933/7296; 2921/7218; 2890/7167; 2903/7165; 2891/7165
2) Test results after patch applied (tested today on 05-October-2023):
2905/7209; 2897/7204; 2943/7357; 2954/7341; 2889/7185; 2915;7240
The battery life is something that also seems normal but at least for the moment for me I have the feeling that was a bit longer for my 14 Pro Max but I may be wrong... time will tell in another 10-20 days I will see how it goes.
Honestly I was expecting that the CPU performance to be reduced but comparing the tests results as it looks this is not the case.
Woow what can I say then congratulations to Apple engineers!
I will test the phone for another 5-6 days and if the issue is completly gone then the new iphone 15 Pro Max will remain and the 14 Pro Max will need to find a new owner.
Congratulations to Apple, not sure what was wroong and how the new iphone was fixed but is defintelly not heating anymore and works as expected!
Congratulations Apple and Thank You!