I had my Note 10+ 5g sent for repair about a week ago to repair the wireless charging. They ended up replacing both the charging coil and the motherboard. After setting up the phone again and using it, I have noticed that it regularly reaches 40°C (+3°C) when just using the phone (videos, browsing, light gaming etc). The phone gets warm to the touch.
I hear that it is normal, but the performance is clearly affected at such temperatures when the optimal operating temp. is around 35-ish°C.
I tried running some benchmarking apps like geekbench 5 and got results like:
1st: 310 and 1142
2nd: 327 and 1966
Before I sent the phone off it would be a lot higher for single core.