KDE Sytem monitor has that function, too. You just have to add it to the history page (Sensors/GPU/Usage)

You can setup PiHole to block Samsung’s ad servers. Some routers give you the option to block specific websites, that works, too.

The site you have to block:

• samsungads dot com
• samsungtvads dot com

Yes, it does. You can also use the tool to check if a file is cached (just run it without any arguments for that).