Need some advice on starting point

So I’m new to development in the Unreal Engine, and need some advice about where to start due to the possible resource hungry nature of my game idea. The base idea is essentially a 3D particle sandbox with multiplayer. The problem is that most particle or particle-like sandbox style games are typically very hard on system resources if you get too much going on at once. My original plans where either a large amount of sphere actors or see if I would be able to use the particle system as the game instead of a ton of actors.

I just need to know if Unreal Engine is designed to handle this or if I need to look more into a more particle oriented physics engine to lower my potential overhead. I would hate to spend weeks or months of my time only to find I have to scrap it all and start from scratch because it can’t handle the load.