From "Classic Race to World First, Day 4 Recap" https://classic.wowhead.com/news=294...st-day-4-recap

Other than KennyMarsh, the players still in the race are grinding as much as they can in Zul'Furrak. Something that just started recently with players in the Classic Race to World First have been doing Raid Groups of up to 10 players in Dungeons. This was technically possible in Vanilla, but players aren't entirely sure this is the most effective way to farm experience quickly. There seems to be some conversation happening on its effectiveness, even amongst players in the race.