Synchronization question

I have a scene with a large number of runtime instantiated network scene objects on the MC. When a new player enter the room those objects will automatically get instantiate on the client's scene by Photon. My question is will it become a problem for the client to handle all the instantiations? Will it run out of buffer/processing cycle? If so, is there anyways to get the instantiations of network objects to happen across a period of time, rather than instantaneously?

Thanks
David