improve performance for show/hide graphs

src/gui_qt/main/management.py

@@ -385,12 +385,16 @@ class UpperManagement(QtCore.QObject):
 
     def change_visibility(self, selected: list, deselected: list):
         """Change status of list of ids after status change in datawidget"""
+        for item_list, func in [(selected, 'show_item'), (deselected, 'hide_item')]:
+            grouping = {}
+            for s in item_list:
+                g = self.data[s].graph
+                if g not in grouping:
+                    grouping[g] = []
+                grouping[g].append(s)
 
-        for s in selected:
-            self.graphs[self.data[s].graph].show_item([s])
-
-        for d in deselected:
-            self.graphs[self.data[d].graph].hide_item([d])
+            for k, v in grouping.items():
+                getattr(self.graphs[k], func)(v)
 
     @QtCore.pyqtSlot(str, str)
     def change_keys(self, identifier: str, name: str):