JSONItem.ToString is very slow

JSON is so important component in any app, but why it’s so slow?
For example, in one test, it’s 30 times slower on creating the json string than using YAJL (cross-platform C library).
http://lloyd.github.io/yajl/

Please see these feedbacks from Christian about JSONItem performance:
feedback://showreport?report_id=31751
feedback://showreport?report_id=21015

if you want speed, use MBS Plugin.