I making a horror game with my friends and I try to make a nice ball pit for the player the problem is I cant put 7k Balls with gravity and simulate physics in one place because of the lake of fps and performance I as thinking about a idea that it will be awake when the player is near and when is far it will be in sleep mod or any good performance idea cuz there is noting in google 
if anyone have some kind of idea please share with me
Hi.
You should try using Niagara particles to achieve this effect. You can create 3d balls with collision and spawn them with Niagara, this way they should be way more performant.
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Hello!
Following the idea of Polysiens, you can use this video as reference to make a ball pit with physics with Niagara system, the performance should be a lot better than using individual physical components
Hope this helps!
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I think its what I want but is looking a bit complicated I try to make something simpler by seeing this video UE4 - Niagara Collision - YouTube but I think I need to go the hard work and learn how to adjust it to be the right fit
thank you for helping is a very nice share so thank you for the help 
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