Slow performance on JSONObject.toJSONString(Map map) about json-simple HOT 7 CLOSED

May I suggest you to try 
http://code.google.com/p/json-smart
this fork is a json-simple with better performances.

Thank you for the suggestion, I will check it.

I think the attached patch fixes this issue, though using a slightly different 
approach. The main idea is the same -- serialize nested maps to a single buffer
instead of making repeated copies. 

I'd argue that json-simple shouldn't list "High performance" as one of its 
features while this issue is not resolved--or at least it should clarify that 
"high performance" only applies to parsing, not serialization. This issue makes 
serialization an O(n^2) when it should be O(n).

There's no need to use StringBuffer (which is synchronized) because the 
corresponding variable is not used by multiple threads. Use StringBuilder 
instead - it's much faster.

This is done in r216.

@g.byczynski Sadly, we can't use StringBuilders as long as we're trying to 
maintain JDK 1.2 compatibility.