Even your exact code is taking close to 3.5 seconds for me. I am running the code remotely compare to your localhost. 

Bob,

You are getting 0ms because you did not start the StopWatch :)

Can you please add that to your code and test it at your end?

var watch = new System.Diagnostics.Stopwatch();
 watch.Start();

Thanks for the quick response.

Yes, data structure is different and I was running over the network. Let me remove those variables and run few more tests.

I will get back to you soon.