Macbook Pro 2019 Stalling, freezing when working with heavy graphics etc.

Hello all,

I am new to this community, however a loyal Mac/Apple user since mid-2000's.

We have a 2019 MacBook pro/16inch/16GB RAM/Intel/Ventura 13.4.1 with the touch bar.

I am a designer and work with heavy graphics files all the time. However lately It has become impossible to work on my machine due to the following reasons:

1. Whenever I work on design software like Adobe Photoshop, Illustrator, etc. – the machine starts stalling immediately. After every click, it will take a few seconds to react, and in a few minutes, the whole system will shut down. It will show dotted trails on my screen ( screenshot attached).
2. I can't even browse Apple's site, as there are a lot of moving graphics and animations on the new iMac/Macbook pages.
3. Watching videos on YouTube/Netflix doesn't stall the computer.
4. Design software like Canva and Figma that runs in the browser works fine most of the time.

I already have:

1. Formatted the hard drive and installed a new OS.
2. reset PRAM, worked in safe mode
3. Re-installed Adobe products multiple times, but the problem doesn't go away.
4. If I attach an external monitor, the issue remains the same. Hence I assume that nothing is wrong with the screen.

Any help would be greatly appreciated. This machine is my bread and butter and I want this to work smoothly as soon as possible with as little expense as possible at the moment.

Thank you again.