Intel HD620 - flickering and glitches in Fusion 360

Hi,
I have Sonoma 14.6 on my Lenovo Yoga 710-14ikb running. I disabled the dGPU and use the Intel HD620. It's showing 2048MB memory (I have 16GB RAM if it matters). The transparency effects are working fine and the performance is decent, I think.

I also can use my 3D printing slicer (Bambu Studio) without any issues.

But I noticed, when I use Fusion 360, especially in full screen, the screen starts to flicker and sometimes it even glitches with frozen images fading away. When I switch back to non-fullscreen it works again - sometimes at least.

I also tried Fusion 360 on Windows 11 without dGPU where the performance is way better and there's also absolutely no flickering at all.

The fans are also spinning at high speed while the body doesn't feel warm at all - on Windows it's not the same, the fans aren't spinning that much and the laptops body feel way warmer.

I didn't noticed this issue in other programs, yet. Maybe you have an idea how to test it on others.

Here's my DeviceProperties:

https://preview.redd.it/h7rzfxlys9id1.png?width=881&format=png&auto=webp&s=24e648addc62caa3afcc97cfa4110d1bcdc082c7

Any ideas how to fix this and maybe increase the performance a bit, if it's even possible?

I'm using OC 1.0.1, btw.
My kexts:

https://preview.redd.it/c8om8kbzs9id1.png?width=768&format=png&auto=webp&s=c75c50fbab0b505c19271024e7c89cd0d8b818f6