Obtain maximum possible performance of new laptop

[Kuroki]

Hi, I recently got a laptop from PCSpecialist, precisely the 15,3" Lafité® AI AMD model. The specs are the following:

CPU: Ryzen 7 - 8845HS
iGPU: Radeon 780M
RAM: 16GB

The thing is that, I would like to get as much performance as possible from it, as I've seen many positive reviews from this APU and it can deliver some nice perfomance on different types of applications, in my case I'm going to use it both for some gaming from time to time and some programming with Unity and Godot. But after starting to use it, I've noticed that (or at least I have the feeling that) I was leaving some performance on the table. After some testing, these are the elements that I believe that are taking back part of the possible performance of this system:

• Firstly, the iGPU has only assigned around 400MB of RAM as VRAM, so my first idea was to assign more VRAM but I couldn't find the option anywhere in the OS or the BIOS settings.
• Secondly, after some midly heavy workload, the CPU would start to thermal throttle (or that's what I thought it was) and I would have some perfomance drops until the fans would cool it down again, once again I could not find anywhere in the OS or the BIOS a way to modify the energy consumption of the CPU or most preferable, to control better fan speed and how they cool the CPU.

So, my question is: Does anyone know if I can control or modify any of those values, adjust TDP or even modify other values and configurations to improve perfomance or obtain as much performance as possible from this APU ?

Thank you!