It's definitely slower on Emperor because the fastest you can steal a worker is turn 20+. You can't just walk up to the nearest civ, steal a worker, improve a luxury and sell it for 240 to buy a settler like you usually can on Deity.
So where on deity you'd do like scout,scout,shrine,settler, you now have to do like.. scout, shrine,worker, settler, settler.
Or just scout, shrine, settler, settler.
Either way your start is really slow and crap and you have to use the rest of the game to catch up to where you'd be if you just got free fast 2-3 workers like on Deity.