diff --git a/src/plugins/coreplugin/dialogs/settingsdialog.cpp b/src/plugins/coreplugin/dialogs/settingsdialog.cpp
index f123489..7955c85 100644
--- a/src/plugins/coreplugin/dialogs/settingsdialog.cpp
+++ b/src/plugins/coreplugin/dialogs/settingsdialog.cpp
@@ -57,6 +57,7 @@
 #include <QStyledItemDelegate>
 #include <QToolBar>
 #include <QToolButton>
+#include <QDebug>
 
 static const char categoryKeyC[] = "General/LastPreferenceCategory";
 static const char pageKeyC[] = "General/LastPreferencePage";
@@ -399,6 +400,7 @@ void SettingsDialog::createGui()
 
 SettingsDialog::~SettingsDialog()
 {
+    qDebug() << Q_FUNC_INFO;
 }
 
 void SettingsDialog::showCategory(int index)
@@ -585,6 +587,7 @@ bool SettingsDialog::execDialog()
         m_instance = 0;
         // make sure that the current "single" instance is deleted
         // we can't delete right away, since we still access the m_applied member
+        qDebug() << Q_FUNC_INFO << " deleteLater";
         deleteLater();
     } else {
         // exec dialog is called while the instance is already running
@@ -595,6 +598,7 @@ bool SettingsDialog::execDialog()
         // a break point it will complain about missing helper, and offer the
         // option to open the settings dialog.
         // Keep the UI running by creating another event loop.
+        qDebug() << Q_FUNC_INFO << " add loop";
         QEventLoop *loop = new QEventLoop(this);
         m_eventLoops.append(loop);
         loop->exec();
diff --git a/src/shared/proparser/qmakebuiltins.cpp b/src/shared/proparser/qmakebuiltins.cpp
index 90f9b25..dc08ff9 100644
--- a/src/shared/proparser/qmakebuiltins.cpp
+++ b/src/shared/proparser/qmakebuiltins.cpp
@@ -56,6 +56,7 @@
 #endif
 #include <stdio.h>
 #include <stdlib.h>
+#include <QDebug>
 
 #ifdef Q_OS_WIN32
 #define QT_POPEN _popen
@@ -331,6 +332,11 @@ void QMakeEvaluator::runProcess(QProcess *proc, const QString &command) const
 
 QByteArray QMakeEvaluator::getCommandOutput(const QString &args) const
 {
+    static QHash<QString, QByteArray> m_cmd_cache;
+    QString key = currentDirectory() + args;
+    if (m_cmd_cache.contains(key))
+        return m_cmd_cache.value(key);
+    qDebug() << currentDirectory() << " " << args;
 #ifndef QT_BOOTSTRAPPED
     QProcess proc;
     runProcess(&proc, args);
@@ -345,7 +351,9 @@ QByteArray QMakeEvaluator::getCommandOutput(const QString &args) const
         m_handler->message(QMakeHandler::EvalError, QString::fromLocal8Bit(errout));
     }
 # endif
-    return proc.readAllStandardOutput();
+    QByteArray res = proc.readAllStandardOutput();
+    m_cmd_cache.insert(key, res);
+    return res;
 #else
     QByteArray out;
     if (FILE *proc = QT_POPEN(QString(QLatin1String("cd ")
@@ -360,6 +368,8 @@ QByteArray QMakeEvaluator::getCommandOutput(const QString &args) const
         }
         QT_PCLOSE(proc);
     }
+    m_cmd_cache.insert(key, out);
+    qDebug() << "inserted, " << m_cmd_cache.contains(key);
     return out;
 #endif
 }