Quote Originally Posted by ChrisW67 View Post
Every time the view asks for the Qt:ecorationRole you load a pixmap from a file, scale it, convert it to a QImage, and return it. None of those operations is cheap, some of them unnecessary. Take a look at QPixmapCache
I tried this below, but it still seems to slow.
Qt Code: 
  1. def data(self, index, role):
  2.  
  3. 		if index.isValid() and role == QtCore.Qt.DecorationRole:
  4. 			row = index.row()
  5. 			column = index.column()
  6. 			value = self._listdata[row][column]
  7. 			key = "image:%s"% value
  8. 			pixmap = QtGui.QPixmap()
  9. 			# pixmap.load(value)
  10. 			if not QtGui.QPixmapCache.find(key, pixmap):
  11. 				pixmap=self.generatePixmap(value)
  12. 				QtGui.QPixmapCache.insert(key, pixmap)
  13. 			# pixmap.scaled(400,300, QtCore.Qt.KeepAspectRatio)
  14. 			return QtGui.QImage(pixmap)
  15.  
  16. 		if index.isValid() and role == QtCore.Qt.DisplayRole:
  17. 			row = index.row()
  18. 			column = index.column()
  19. 			value = self._listdata[row][column]
  20. 			fileName = os.path.split(value)[-1]
  21. 			return os.path.splitext(fileName)[0]
  22.  
  23. 	def generatePixmap(self, value):
  24. 		pixmap=QtGui.QPixmap()
  25. 		pixmap.load(value)
  26. 		pixmap.scaled(100, 120, QtCore.Qt.KeepAspectRatio)
  27. 		return pixmap
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