During what levels? 10-25, IMO, are superfast and I've outleveled the quests multiple times.
25-35 leveling in relation to quests was slower, but I still generally was finishing quests after I hit the end of XP for the campaigns because leveling was so fast.
45-50 is a different story, but even there, hunting down 100 things from bosses -- where not each boss drops the thing -- is way more than enough to level several times before finishing the quests.
Just my experience, though...
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