One hurdle in writing good, well performing AJAX applications is the parsing of data. One way of trying to improve the performance has for a long time been to use JSON in the transport layer. While being pretty efficient, and reasonably well supported in server side implementations, the perfomance of serializing/deserializing large JSON objects in the client side has left much to wish for.
Luckily, this is about to change :)
The Mozilla guys have implemented a native JSON parser and will be exposing that to use with JavaScript in coming releases. Furthermore, IE8 beta 2 features a native JSON parser. Now we can just hope that the WebKit guys follow the trend ... Google Chrome with a built in JSON parser would likely rock ;)
IE8 Blog: Native JSON in IE8
Moz JSON support
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