Linqpad 5 Slow execution - AsNoTracking


when running a very simple entity frameworks query it takes between 2.4 and 3 seconds to execute and paint the results, I'm trying to use AsNoTracking() but even if I add the namespace for it to the query (System.Data.Entity) the method isn't available.

Simple query:

var test = (from es in TABLEX
where es.PROPERTYX == 1000
select es).AsNoTracking().FirstOrDefault();


In the above example it doesn't recognise .AsNoTracking()

I can't see what I'm doing wrong?

Thanks in advance.

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