What does ESP in Rust actually show you?
ESP is not magic. It is information the game already holds - the difference between a good overlay and a cluttered one is what you choose to show.
ESP stands for Extra Sensory Perception, but nothing about it is extrasensory: the client already knows where every player is, because it has to draw them. ESP simply renders that same data as a box on your screen.
Four elements carry almost all the value: box, name, distance and health. The rest - skeleton lines, weapon labels - add clutter more than information.
The box has to follow the real body, not a fixed height. A crouched or prone player under a fixed box reads wrong, and that is exactly how shots end up in the air.
Distance is the most important number, because it decides whether you close in or hold. Names matter for telling teammates from enemies, though on a quiet server you can turn them off.
One last thing: ESP is a responsibility more than an advantage. The more you put on screen, the slower you decide. Show less, see better.