For example there are poco class:

class Foo{/*code*/} 

and decorator class

class FooWrapper 
{

    public FooWrapper (Foo wrapped)
    {
        Wrapped = wrapped;
    }

    public Foo Wrapped{get;} 
    /*Decorating Methods*/
}

which has just one auto property only and a plenty of decorating methods. So, allocated objects are really small and contain only one reference. How badly frequent allocations of FooWrapper e.g.

List<FooWrapper> GetListOfWrappedFoo(List<Foo> list) 
                          => list.Select(it => new FooWrapper(it)).ToList();

can affect efficiency?

I've tried to find an answer on different resourses, but unfortunately I've failed.