its not a bug, its a feature. its updates, telemetry and other stuff they want you to use like edge. you can see it for yourself on the task manager.

you can use some feature disabler apps to cut out a lot of this crap but theres only so much you can do on windows. updates are crazy heavy for what they are.

it is however a substantial improvement, they undo the mods on update and you will have to play little a cat and mouse game to keep it good.

windows can be improved but linux is the permanent solution for weaker hardware if you can use it.