The results were interesting, but predictable. Newtonsoft's JSON parser is known to be one of the fastest (see bar chart on its Codeplex homepage).
Time taken to parse a simple JSON string in a loop of 1000 iterations:
Google Chrome V8: 138ms
Newtonsoft JSON.Net: 9ms
I'd like to run the test again with a much bigger and more complex JSON object with multiple levels of child objects. I'd also like to compare the framework's DataContractSerialiser too, to make it a more comprehensive benchmarking suite.
This was not a scientific test, just a quick eperiment, and there is obviously more to consider in JSON parsing than the points of interest that I present above.
18 June 2013