converting list to JSON - performance issue.

[anda_skoa]

QVariant objQVariant = iter.key();//Gives the value of Iteration - 0,1....

No, gives the key of the iteration.
Actually a QString.

calling just value(key)

Some code snippet Please.

Really? You need a code snippet for a single method call on an object?

map.value("title");

map.value("title");

To copy to clipboard, switch view to plain text mode 

Cheers,
_