Why is the processor constantly in economy mode?

Question

Windows

Xiaomi Notebook Pro 15.6
Proc i5 8250U
GPU GTX MX150
RAM 8 GB

Since half a week ago, my laptop performance has dropped sharply. Realizing that nothing just happens, I drove the stress away with the Aid64 test - it showed very fast heating and, accordingly, throttling. Dismantled, cleaned, changed the thermal paste. I ran it again - everything is fine, it does not overheat.
However, he did not work faster. Recently, the laptop has been used mainly for games, and in them the performance has remained at the same low level. Started digging...
I came to the conclusion that for some reason I had a hard-fixed processor frequency at 1497 MHz. Even with a stress test, when the load on the percent is 100%, the frequency remains at this ill-fated figure. For example: when starting the system in safe mode, the frequency became the base 1800 + - MHz. But in normal mode, it is rigidly fixed, no matter what stress tests or games I turn on.
Updated processor drivers. Power settings too - set to "Maximum performance". In the Intel utility Intel Turbo Boost Technologycal Mobitor 2.0, I see a regular green leaf, indicating that the percentage is in saving mode. The laptop works from the network all the time.
Windu did not update - the last update was "more than 10 days ago", which is why I can not return to the previous version.

The problem seems to be clear, but I can not solve it. Help good people...

Answer 1

1. Overheating - at high temperatures there will be throttling
2. Turbo boost (on or off), there is still a dynamic change in frequency under load, but xs, as Intel calls it.
3. The power supply is connected / disconnected (you still need to look at the battery charge - perhaps the power of the PSU is not enough to charge it at maximum performance)
4. Look in more detail at the Windows power profiles
Control Panel -> Hardware and Sound -> Power Options -> Change scheme settings -> Change advanced power settings -> Processor power management

Answer 2

Try creating a completely new power plan.