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copied!<p>There are a couple things to consider in there. First, just so you know the right terminology, this is actually unboxing (you've taken a value-type and stored it as a reference-type, or boxed it. Reverting to the value-type is unboxing).</p> <p>Second, I'd wager that the majority of your code isn't in the unboxing, instead it's in the multiple calls into the cache dictionary:</p> <pre><code>if (cast_cache.ContainsKey(id) && cast_cache[id].ContainsKey(key)) return (int)cast_cache[id][key] </code></pre> <p>I count 5 dictionary traverses in there: cast_cache.ContainsKey(id), cast_cache[id], .ContainstKey(key), cast_cache[id], and [key]. </p> <p>That's pretty harsh. You could cut down on a lot of these by using an aggregated key. Instead of looking for [id][key], combine those into a single object. That would cut your number of dictionaries down exponentially and cut those lookups down to 2, 1 if you skip the ContainsKey() with a try/catch (check the speed on that).</p> <p>Here's a class that would allow you to combine those:</p> <pre><code>public class Vector { private object[] _Data; public object this[int index] { get { return _Data[index]; } } public Vector(params object[] data) { _Data = (object[])data.Clone(); } public override bool Equals(object obj) { Vector OtherVector = obj as Vector; if (OtherVector == null) return false; if (OtherVector._Data.Length != _Data.Length) return false; for (int I = 0; I < _Data.Length; I++) if (!_Data[I].Equals(OtherVector._Data[I])) return false; return true; } public override int GetHashCode() { int Result = 0; for (int I = 0; I < _Data.Length; I++) Result = Result ^ (_Data[I].GetHashCode() * I); return Result; } } </code></pre> <p>Try that out and see how your speed goes</p>

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