Brent Ozar uses most of Resource Governor:
You’ve got a bunch of users on the same SQL Server, and you wanna know who’s using the most resources. SQL Server doesn’t make this easy. You can query some management views to see which queries or databases have been using the most resources, but you can’t intuitively tell which USERS are.
To solve this problem, we’re going to use Resource Governor.
Wait. Come back.
I’ve always liked the idea behind Resource Governor and since about SQL Server 2016, it has been quite a useful product because “make some queries slow down” can absolutely be the right answer when those queries are harming the performance of queries which matter more.