ogoffart@oscar demos]$ ./textedit/textedit 
HASH stat: total=1024  dup=678
STRING stat: total=53616  hashed=344
[ogoffart@oscar demos]$ ./textedit/textedit 
HASH stat: total=5132  dup=4072
STRING stat: total=101315  hashed=1057
[ogoffart@oscar demos]$ qmlviewer 
Qml debugging is enabled. Only use this in a safe environment!
HASH stat: total=5341  dup=3989
STRING stat: total=70257  hashed=1323
[ogoffart@oscar demos]$ qmlviewer 
Qml debugging is enabled. Only use this in a safe environment!
HASH stat: total=1691  dup=732
STRING stat: total=14373  hashed=930
[ogoffart@oscar demos]$ ./browser/browser 
HASH stat: total=2951  dup=1080
STRING stat: total=111836  hashed=1870




diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp
index f43e888..bfd34dd 100644
--- a/src/corelib/tools/qhash.cpp
+++ b/src/corelib/tools/qhash.cpp
@@ -94,8 +94,22 @@ uint qHash(const QByteArray &key)
     return hash(reinterpret_cast<const uchar *>(key.constData()), key.size());
 }
 
+
+#include <iostream>
+
 uint qHash(const QString &key)
 {
+    struct Stat {
+        QBasicAtomicInt count;
+//        QBasicAtomicInt simple;
+        QBasicAtomicInt dup;
+        ~Stat() {  std::cout <<"HASH stat: total=" << int(count) << "  dup=" << int(dup) <<   std::endl; }
+    };
+    static Stat s = {0, 0};
+    s.count.ref();
+    if (key.asciicache())
+        s.dup.ref();
+    key.setAsciicache();
     return hash(key.unicode(), key.size());
 }
 
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index ee45cfd..71e33e5 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -1219,9 +1219,22 @@ QString::QString(QChar ch)
     \internal
 */
 
+#include <iostream>
 // ### Qt 5: rename freeData() to avoid confusion. See task 197625.
 void QString::free(Data *d)
 {
+
+    struct Stat {
+        QBasicAtomicInt count;
+        //        QBasicAtomicInt simple;
+        QBasicAtomicInt hash;
+        ~Stat() {  std::cout <<"STRING stat: total=" << int(count) << "  hashed=" << int(hash) <<   std::endl; }
+    };
+    static Stat s = {0, 0};
+    s.count.ref();
+    if (d->asciiCache)
+        s.hash.ref();
+    
 #ifdef QT3_SUPPORT
     if (d->asciiCache) {
         Q_ASSERT(asciiCache);
diff --git a/src/corelib/tools/qstring.h b/src/corelib/tools/qstring.h
index bf0a0ad..9c82029 100644
--- a/src/corelib/tools/qstring.h
+++ b/src/corelib/tools/qstring.h
@@ -590,6 +590,10 @@ public:
 
     QString(int size, Qt::Initialization);
 
+    bool asciicache() const { return d->asciiCache; }
+    void setAsciicache() const {  const_cast<Data *>(d)->asciiCache = 1; }
+    
+    
 private:
 #if defined(QT_NO_CAST_FROM_ASCII) && !defined(Q_NO_DECLARED_NOT_DEFINED)
     QString &operator+=(const char *s);
@@ -600,6 +604,7 @@ private:
     QString &operator=(const QByteArray &a);
 #endif
 
+
     struct Data {
         QBasicAtomicInt ref;
         int alloc, size;
@@ -712,7 +717,7 @@ inline QChar *QString::data()
 inline const QChar *QString::constData() const
 { return reinterpret_cast<const QChar*>(d->data); }
 inline void QString::detach()
-{ if (d->ref != 1 || d->data != d->array) realloc(); }
+{ if (d->ref != 1 || d->data != d->array) realloc(); else if (d->ref==1) d->asciiCache = 0; }
 inline bool QString::isDetached() const
 { return d->ref == 1; }
 inline QString &QString::operator=(const QLatin1String &s)