FrozenSet Lookup Performance

The typical method to look up an item in a FrozenSet collection is by using TryGetValue(), as demonstrated in the example below:

_ = collection.TryGetValue(person, out var result);

Next, let’s compare the TryGetValue() method for a FrozenSet, ImmutableHashSet, and HashSet, as well as performing a lookup in a List using a LINQ Lambda expression.

Benchmark Results

As you can see in these results, HashSet and ImmutableHashSet are slightly more performant than FrozenSet. Additionally, FrozenSet is 22 times faster than performing a lookup in a List using a LINQ lambda expression.

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