| http://www.w3.org/ns/prov#value | - with == and !=, the interpreter has to pull up both referred objects in order to make a comparison (of whether they are the same or not), while is and is not simply just check the values of the objects they are referring to. with this said, you can see that the latter pair will perform faster because you do not have to fetch the objects themselves in order to make the comparison. here is a speed test
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