thermal settings

Ultra performance will make the heat issues far worse, which is why the system is reverting.

It would help to know what model system you have (Inspiron 3593, 5501, etc.) and what's running when you have the overheating issue.

Enable power saver mode in either Windows settings or the BIOS.

Ultra performance will destroy your computer, it is the maximum performance you can get.

If you want to disassemble your computer, check if there is a sticker under the cooler and if there is no thermal paste on the CPU, apply some.

@ejn63​ what model, you mean Dell G16 7630?

usually when I'm running only internet it heats a lot, and only with ultra performance it's not over heated! What do you mean that this feature makes it far worse?

@gravitycoil828​ my power saver is on from 50%, but only when not plugged to power.

I have never disassembled a computer. I can try, it seems to need few unscrewing. Do you have any tips for all this?

Before disassembling anything, set the system to a balanced performance plan and if you're simply browsing the Internet, disable the discrete GPU in favor of the internal one -- you don't need the discrete GPU running for browsing purposes.  Set your browser to run with the Intel GPU.

That should solve the heat issues.  The GPU consumes several times more power than the CPU does, and if you try running both in high performance mode, the system just doesn't have the thermal mass necessary to dissipate that much heat from the system.

@gravitycoil828​ also why is it that Ultra performance is so bad for the computer?

@chaza​ Ok, so: Follow ejn63 for disassembling. Now, let me tell you why Ultra Performance is terrible.

By ultra performance, it means stretching out your components e.g. your computer, to its capabilities. For example lets say you were playing a game. Having it on the maximum level means it will have better performance, but on the inside the components will start to rot. For example capacitors may break and your RAM might malfunction and start a fire. These are rare though. It's also worthy to add that maximum performance drains your battery the fasted as it uses the most power compared to the standard or low power modes.

By the way, I made this response on my 17 year old Dell Inspiron 1501. ;D

Simple answer:  the system is not built to dissipate the heat generated by running the CPU and GPU at full power.  Some large gaming systems can handle this;  budget notebooks like the Inspiron and G-series cannot.