Extremely high memory usage on DELL XPS 15 despite being brand new and running no programs

You did helpfully provide the screenshot of Task Manager showing the processes using the most memory. If you can eliminate some of those processes, you will free up the memory they are using. You certainly can go to Settings > Apps > Startup and disable some of the apps you're not using, like Teams, OneDrive, etc. You can also free up some memory by uninstalling Dell SupportAssist, though you would lose its functionality, and possibly miss alerts to install critical driver updates.

That answer is actually too pat. It's kind of a truism that unused memory is wasted memory. Many of those processes on the list are dormant most of the time, but if needed they can act immediately since they are resident in memory. If your system needs memory for a high-priority task, the least recently used tasks will get offloaded to make room. If the system is starved for memory it'll spend a lot of time copying memory images to and from secondary storage (your SSD) but you're not remotely close to that happening. I don't think you have a problem at all, but you can certainly take the actions above to maximize your available memory.

Uninstall all of the garbage Dell ships installed. It's ridiculous that RAM utilization is ~65% out of the box.

For comparison's sake, I have another laptop, also running Windows 11 with 16GB of RAM, and RAM utilization is ~20% at startup. Dell lost their way many years ago. If it wasn't work issued, I wouldn't be using a Dell.

Same problem did u find a solution?