I have implemented my own (very simple though) QStandardItemModel-qtableview.

Qt Code: 
  1. #ifndef PARAMETERMODEL_H
  2. #define PARAMETERMODEL_H
  3. #include <QtGui>
  4. #include <QtSql/QSqlTableModel>
  5. #include <QtSql/QSqlRelationalDelegate>
  6. #include <QtSql/QSqlQuery>
  7. #include <QMessageBox>
  8. #include <QComboBox>
  9. #include <QWidget>
  10.  
  11.  
  12. #include <comboboxDelegates.h>
  13. #include <spinboxdelegates.h>
  14.  
  15. class ParameterModel : public QWidget
  16. {
  17.     Q_OBJECT
  18.  
  19. public:
  20.     ParameterModel( QWidget *parent = 0);
  21.  
  23.     QTableView* tableView;
  24.  
  25.  
  26.  
  27. public slots:
  28.     void addNewRow();
  29.     void addNewRow2();
  30.  
  31.     void deleteRow(int);
  32. private:
  33.     QVBoxLayout* vboxlayout;
  34.  
  35.     ActionComboBoxDelegate *actionComboBoxDelegate;
  36.     TypeComboBoxDelegate  *typeComboBoxDelegate;
  37.     StatusComboBoxDelegate *statusComboBoxDelegate;
  38.  
  39.     VrotSpinBoxDelegate *vrotSpinBoxDelegate;
  40.     SigmaSpinBoxDelegate *sigmaSpinBoxDelegate;
  41.     GammaSpinBoxDelegate *gammaSpinBoxDelegate;
  42.     XiSpinBoxDelegate *xiSpinBoxDelegate;
  43.     SemitSpinBoxDelegate *semitSpinBoxDelegate;
  44.     DlradSpinBoxDelegate *dlradSpinBoxDelegate;
  45.     LlabSpinBoxDelegate *llabSpinBoxDelegate;
  46.     AWSpinBoxDelegate *aWSpinBoxDelegate;
  47.     EiSpinBoxDelegate *eiSpinBoxDelegate;
  48.  
  49.  
  50. };
  51. #endif // PARAMETERMODEL_H
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I usually need 3-5 of these, which I append them to a QVector

Qt Code: 
  1. QVector<ParameterModel*>* modelVector;
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My problem is that when I am trying to set the data to the items, it gets slow

Qt Code: 
  1. QElapsedTimer t;
  2.                     t.start();
  3.                     if ( column_index < 4 )
  4.                        modelVector->at(model_index)->model->item(row_index,column_index)->setData(line);
  5.                     qDebug()<<t.elapsed();
  6.                     t.start();
  7.                     if ( column_index > 4 )
  8.                        modelVector->at(model_index)->model->item(row_index,column_index)->setData(line.toDouble());
  9.                     qDebug()<<t.elapsed();
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The timers here give values 500-600. The strange thing is that the output is usually like this (I run it multiple times)
0
593
....
577
0
....
562
0
etc,etc.
What can I do to make it faster?