Why is my program so much slower in Nim than in Rust?

[Stefan_Salewski]

    proc `+`(p: Point, v: Vector): Point =
        newPoint(p.x + v.x, p.y + v.y)
    
    
    Run

Maybe these procs are not inlined automatically.

You may try to apply inline pragma on the procs, or compile with passC:-flto 
for link time optimization.