Nvidia GeForce MX150 too weak for LoL?

I got a HP Envy x360 that uses 8GB of RAM, an Intel Core i5-8250U CPU and an integrated Intel UHD 620 graphics card and a dedicated Nvidia GeForce MX150 (4GB). When I start on the League of Legends laptop, the game always runs at over 200 fps for the first few seconds (when I use the Nvidia) and about 130 for the UHD 620. But after a short while, the rate drops to about 50 fps on each lap and in a fight even 40 fps and it can't be played with. Should not at least the Nvidia at least come to 80 fps in the middle of the game? I even play extra with the lowest quality possible, leaving only the resolution at 1920x1080 because my laptop supports Full HD. Can anyone help me? Is that normal that things are going so badly? Despite the lowest quality, my laptop is buzzing extremely loud, so the fan works extremely hard in gaming, which seems to me to be too much. My age of Acer is already several years old and although it is now enormously slow, but the works with an i3 processor (graphics card is currently unknown to me and I think the i3 is the 5th Generation and the laptop has only 4 GB of RAM) in gaming better than my new HP, which seems pretty strange to me. After all, the old one from Acer permanently delivers 70-80 fps and does not drop to 40-50.

That sounds like a thermal throtteling to me, especially because the Envy has little room for heatsinks. When the components are heavily loaded, the power consumption increases, thereby the heat dissipation. If the cooling, as in your case, this is overwhelmed, the heat dissipation / power consumption must be throttled - the FPS fall.

So there's absolutely no other option? It is a pity that you have to have such nice technical data on the sheet, but it does not really help you in practice: /

There are laptop fans on which you can put your laptop. Does not bring so much, but a few degrees. Order such a thing on Amazon, if it does not bring anything, just send it back. But basically the MX150 is sufficiently dimensioned.

You are right, and I rarely agree.

So 200 frames are 5 times as much as the eye can see.

But 50 Hz are really not enough for your class system.

This can even be my 13 year old laptop.

There are settings in the BIOS wrong or the driver is not correct.

Laptops are not suitable for gaming, why do you see yourself. The cooling of the Envy is not enough. The components are getting hot and the laptop is clocking down. Then the performance is in the basement…

Unfortunately, I'm not familiar with the settings in the bios, how should I recognize that they are the right or the wrong ones? What should I put attention on?