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    <p>Interestingly, I passed on feedback about operator support via <code>dynamic</code> being an order-of-magnitude slower for <code>Nullable&lt;T&gt;</code> (similar to <a href="http://social.msdn.microsoft.com/Forums/en-US/vs2010ctpvbcs/thread/287db1b9-c135-40bc-a1c5-a8a51efbfc65" rel="noreferrer">this early test</a>) - I suspect for very similar reasons.</p> <p>Gotta love <code>Nullable&lt;T&gt;</code>. Another fun one is that even though the JIT spots (and removes) <code>null</code> for non-nullable structs, it borks it for <code>Nullable&lt;T&gt;</code>:</p> <pre><code>using System; using System.Diagnostics; static class Program { static void Main() { // JIT TestUnrestricted&lt;int&gt;(1,5); TestUnrestricted&lt;string&gt;("abc",5); TestUnrestricted&lt;int?&gt;(1,5); TestNullable&lt;int&gt;(1, 5); const int LOOP = 100000000; Console.WriteLine(TestUnrestricted&lt;int&gt;(1, LOOP)); Console.WriteLine(TestUnrestricted&lt;string&gt;("abc", LOOP)); Console.WriteLine(TestUnrestricted&lt;int?&gt;(1, LOOP)); Console.WriteLine(TestNullable&lt;int&gt;(1, LOOP)); } static long TestUnrestricted&lt;T&gt;(T x, int loop) { Stopwatch watch = Stopwatch.StartNew(); int count = 0; for (int i = 0; i &lt; loop; i++) { if (x != null) count++; } watch.Stop(); return watch.ElapsedMilliseconds; } static long TestNullable&lt;T&gt;(T? x, int loop) where T : struct { Stopwatch watch = Stopwatch.StartNew(); int count = 0; for (int i = 0; i &lt; loop; i++) { if (x != null) count++; } watch.Stop(); return watch.ElapsedMilliseconds; } } </code></pre>
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    1. POPerformance surprise with "as" and nullable types
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    1. USMarc Gravell
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    1. COYowser. That's a really painful difference. Eek.
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      1. USJon Skeet
    2. COHence some of the obscure code in MiscUtil/Operator ;-p
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    3. COIf no other good has come out of all of this, it's led me to include warnings for both my original code *and* this :)
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