Handles array access speed

Here is my class :

classdef MyClass < handle
    properties (Access = protected)
        indice;
    end
    methods
        function this = MyClass()
        end
    end
end

And here is my fisrt code :

numLoop = 200000;
numTab = 100;
pClassRef = MyClass();
for i=1:numLoop
    for j=1:numTab
        pClass = pClassRef;
    end
end

And here is my second code :

numLoop = 200000;
numTab = 100;
tabClassRef(numTab) = MyClass();
for i=1:numLoop
    for j=1:numTab
        pClass = tabClassRef(j);
    end
end

The first code takes 0.5 s

The second code takes 18 s

Why access to an element of my handles array is so long ?