AsUnordered

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Ordered sequences may hurt performance when dealing with a large number of elements. To mitigate this, it’s possible to call AsUnordered when the sequence order is no longer necessary.

var sequence = Enumerable.Range(1, 10000).Select(x => -1 * x); // -1, -2, ...
var evenNumbers = sequence.AsParallel()
                          .OrderBy(x => x)
                          .Take(5000)
                          .AsUnordered()
                          .Where(x => x % 2 == 0) // This line won't be affected by ordering
                          .ToList();

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