What's your strategy to smoothly add large group of sprites into a layer?

cocos2d-x JavaScript
#1

I faced this kind of situation when I need to smoothly transition into another scene or for the case of such event that needs to add a large group of sprites at once.
It usually produces some kind of lagging. I would ask what’s your strategy to overcome this and maintain a smooth transition and no lags.

Any strategy or ideas are welcome.

#2

I also very interesting in it.
Where is the wasting of the time? Loading resources or drawing?

#3

It’s loading, it will lags for a short period of time then go smoothly afterwards.