Why is QBuffer's close call so slow?

[eekisa]

After further investigation I found out that it is the deletion of "QXmlQuery query" that takes ages. Wysota's tip for moving declations outside the if clause gave me the hint that it could be some destruction (when leaving the if) that is taking such a long time. I moved (byteArray, buffer, sourceDocument and query) declarations to the beging of my method and changed the creation of "QXmlQuery query" to "QXmlQuery* query = new QXmlQuery();". I now see that

//Starting to delete query  "ROUTE"   "ke 8. huhti 09:53:36 2009" 
if (query)
  delete query;
//Finished deleting query  "ROUTE"   "ke 8. huhti 09:53:46 2009"

//Starting to delete query  "ROUTE"   "ke 8. huhti 09:53:36 2009" 
if (query)
  delete query;
//Finished deleting query  "ROUTE"   "ke 8. huhti 09:53:46 2009"

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Any idea why deletion of QXmlQuery takes such a long time.

[eekisa]

I also noticed that it does not help to move the QXmlQuery to class member and pass that to the method as a varaible. This way it would only need to be deleted once after all method calls. Anyway, this is because then QXmlQuery's

"query->bindVariable("inputDocument", &sourceDocument);"

will hold on the second method call. Most likely as to documentation "If name has already been bound, its previous binding will be overridden". So it is the realising of something that is slowing it down..