Creating a Gem fall GUI while not causing lag

Currently I’m trying to make a gem fall similar to the game “Pet Simulator x”. I’m unsure how would I do it since it could cause a lag effect to the player. Any ideas would be greatly appreciated.

(Here is a reference of what I’m talking about)

I’m not sure why it would lag the player unless they had really low bandwidth and the Gem image was trillions of pixels in size! It’s merely a creation of a bunch of GUI’s and tweening them downward with a variation in speed and rotation. If the Gem image is already replicated to the client there should be no issue in reproducing any number of them locally.