Do you mean the android and iOS emulator?
If so then yes, quite a bit.
I don’t know how much difference on the xCode emulator (I have not run my game on an iOS device so can’t tell).
I know my game runs at >50 fps on my android phone but is really slow on the emulator.
Actually, its so slow that I don’t bother running in the emulator.
If you mean running a native Win32 version then no emulation is involved.