Performance difference in empty array initialization

Recently, I've been working in performance/memory optimization and have stucked in the empty array initialization which uses generic method to initialize empty array:

Code implementation of generic empty array class:

    public static class EmptyArray<T>
    {
        public static readonly T[] Instance;

        static EmptyArray()
        {
            Instance = new T[0];
        }
    }

So, whenever creating empty array of any type,it has been called as like:

var emptyStringArray = EmptyArray<string>.Instance;

Such empty array declaration has been done in many places of codebase. I am confused how would it be differs in performance while using :

var emptyStringArray = new string[0];

I've asked to above code author and he has replied me :

Basically, all empty arrays are readonly, and are equal to one another, which means that you can use the same instance (which will be created lazily on demand during run-time)… That should reduce the total number of allocations, reduce memory usage and GC pressure, and should result in some improvement

Still, I am not able to understand how would EmptyArray Instance boost the performance in array declaration.