I need to know

How do we call all elements in a list at the same time without a loading loop? For example like an object wants to print a message at the same time with another object for its elements in a list...

i mean to use multiple scriptis at the same time, is it possible to do with threading or something else..

What do you want to run concurrently?

Anything like for example particles that interact

In that case, iterate over the particles and update each one every frame. You could also connect them to a physics engine backend like Matter.js.