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Terrible Performance on Games on Laptop

I have this computer (specification below) for one year, I am not really a hardcore up-to-date gamer hence my computer. But even I go to games for some fun even for some old ones, it ruins everything.

Perhaps the most annoying FN: New Vegas. A 13-year-old game, yet I can not play with a straight 60 FPS, sometimes even it drops to 40s, and it’s nonsensical. None of the GPUs are really working for the game (Next to GPU2 (MX350) and MEM1 (Xe)), usages of both are below %50 while computer’s fan, battery and game modes are at their highest performance level.

FN New Vegas Screenshot

For the these two 2D games (DST and Ozymandias) it is also hard to understand:

Simple, Hex Strategy Game, Ozymandias, Screeshot

DST Screenshot

Also, for the games that the computer provides little more than the lowest specs (only for GPU), the graphics settings act pretty odd. High -> Medium transition makes no observable difference for the FPS. (Games included: WRC9, Farming Simulator 19, Pure Farming 18, Cities Skylines)

(I could be brutally wrong for this) And as far as it seems to me, if you satisfy the Minimum requirements, it should give at least straight 30 FPS for 1080p Medium or Low. But it almost never happens, it gets too flickering, going between 40 and 20 continuously. Or if it is to some degree achieved then, as I expressed, it gets stuck at that level and my interventions to Graphic settings gives me no ability to change things.

Cities Skylines Screenshot: Fixed 30 FPS, drops but impossible to increase

Pure Farming 18 Screenshot: GPUs are not actively used, graphic adjustments futile,
onlthe Iris Xe gives consistent 30 FPS

It looks like some driver issue or heat prevention mechanism that prevents GPU and CPU to be used normally, maybe because 14″ body/chassis. Last year it impressed me with The Witcher 3 and Bioshock Remastered performance, but even at there, like after some minutes the performance was dropping significantly.

Lenovo V2 G14 ITL – 14″ –
CPU: i5 1135g7 2.4 GHz
GPU: Nvidia MX350 2 GB (Equivalent of 950M-960M) –
RAM: 16 GB 3200 MHz
Integrated: Iris Xe 2 GB(?)
Screen: 60 Hz
WIN10 PRO
(RAM newly upgraded, thermal paste renewed, both made no change)