decoding values_list on a picklefield turns out to be 10 times faster than using list_comprehension

django_q/models.py

@@ -8,6 +8,7 @@ from django.db.models.signals import pre_save
 from django.dispatch import receiver
 from django.utils import timezone
 from picklefield import PickledObjectField
+from picklefield.fields import dbsafe_decode
 
 
 class Task(models.Model):
@@ -32,8 +33,9 @@ class Task(models.Model):
 
     @staticmethod
     def get_result_group(group_id):
-        # values_list() doesn't work here cause it returns encoded fields
+        # values + decode is 10 times faster than just list comprehension
-        return [t.result for t in Task.get_task_group(group_id)]
+        values = Task.objects.filter(group=group_id).values_list('result', flat=True)
+        return [dbsafe_decode(t) for t in values]
 
     @staticmethod
     def get_task(task_id):