Arduino Nano Boot Delay

Is it normal for most Nano boards to have a small delay before running the sketch? Because for all I know, Uno boards run the sketch nearly instantly after powerup. Though this isn't a big problem, I would like to know if there's a way around this.

Use a Programmer, and Upload Using Programmer to have the sketch start immediately after a Reset.

The startup for both is identical - the bootloader on the Nano is bigger than that on the UNO , but can’t see that making a difference.
The previous post shows you how to over write the bootloader so any delay caused by it is removed .