It's pretty much the same. Tenured faculty have a set of prescribed duties, particularly teaching loads. If they have a lot of grants or other duties that they

It's pretty much the same. Tenured faculty have a set of prescribed duties, particularly teaching loads. If they have a lot of grants or other duties that they perform, the teaching burden can be lightened, but they can't just decide to not do anything. When I was in grad school there were professors who were much less active after getting tenure and a full professorship, but this was a fairly competitive school and they worked themselves to the bone to get tenure at a good school. They were obviously burnt out, most left. A few stick around and mostly just perform their teaching duties and some administrative/service work. The top researchers were often not the best teachers, some of the better teachers had let their foot off the gas on the research side (the university wants them to do research because of how the grant structure works).