diff --git a/expenses_manager/expenses/models.py b/expenses_manager/expenses/models.py
index 95339b9..688e0d9 100644
--- a/expenses_manager/expenses/models.py
+++ b/expenses_manager/expenses/models.py
@@ -3,9 +3,10 @@ from decimal import Decimal
 from django.db import models
 from django.conf import settings
 from django.db.models import Sum
+from functools import cached_property
+from django.utils.text import slugify
 from django.db.models.fields import related
 from django.db.models.functions import ExtractMonth
-from django.utils.text import slugify
 
 
 class Category(models.Model):
@@ -357,7 +358,15 @@ class Goal(models.Model):
 
         return self.start_date
 
+    @cached_property
     def progress(self):
+        """Progreso del objetivo. Memoizado: se calcula una vez por instancia.
+
+        Ojo: es una cached_property, no un método. Se accede como `goal.progress`
+        (sin paréntesis), tanto en código como en plantillas. El valor se cachea
+        en la instancia la primera vez; si en la misma petición se modifican
+        gastos y se necesita recalcular, habría que crear una instancia nueva.
+        """
         if self.kind == self.KIND_SAVING:
             # Provisional: saldo de la cuenta asociada. Cuando exista el
             # módulo de inversiones, esta rama es lo único que hay que tocar.
@@ -384,7 +393,7 @@ class Goal(models.Model):
     def percentage(self):
         if not self.target_amount:
             return 0
-        return (self.progress() / self.target_amount) * 100
+        return (self.progress / self.target_amount) * 100
 
     def bar_width(self):
         return min(float(self.percentage()), 100)
@@ -405,7 +414,7 @@ class Goal(models.Model):
         """True si es un presupuesto que ya se ha pasado del límite."""
         return (
             self.kind == self.KIND_BUDGET
-            and self.progress() > self.target_amount
+            and self.progress > self.target_amount
         )
 
     def __str__(self):
diff --git a/expenses_manager/expenses/tests/test_goals.py b/expenses_manager/expenses/tests/test_goals.py
index 2411c8e..e7717ae 100644
--- a/expenses_manager/expenses/tests/test_goals.py
+++ b/expenses_manager/expenses/tests/test_goals.py
@@ -24,7 +24,7 @@ def test_payment_goal_sums_expenses_since_start_date(user, account, category):
         include_subcategories=False, start_date=start, target_amount=Decimal("100"),
     )
 
-    assert goal.progress() == Decimal("20")
+    assert goal.progress == Decimal("20")
 
 
 def test_payment_goal_include_subcategories_true_includes_child_expenses(user, account, category):
@@ -36,7 +36,7 @@ def test_payment_goal_include_subcategories_true_includes_child_expenses(user, a
         include_subcategories=True, target_amount=Decimal("100"),
     )
 
-    assert goal.progress() == Decimal("15")
+    assert goal.progress == Decimal("15")
 
 
 def test_payment_goal_include_subcategories_false_excludes_child_expenses(user, account, category):
@@ -48,7 +48,7 @@ def test_payment_goal_include_subcategories_false_excludes_child_expenses(user,
         include_subcategories=False, target_amount=Decimal("100"),
     )
 
-    assert goal.progress() == Decimal("0")
+    assert goal.progress == Decimal("0")
 
 
 def test_budget_goal_period_month_counts_only_current_month(user, account, category):
@@ -60,7 +60,7 @@ def test_budget_goal_period_month_counts_only_current_month(user, account, categ
         period=Goal.PERIOD_MONTH, target_amount=Decimal("100"),
     )
 
-    assert goal.progress() == Decimal("30")
+    assert goal.progress == Decimal("30")
 
 
 def test_budget_goal_is_exceeded_true_over_target(user, account, category):
@@ -92,7 +92,7 @@ def test_is_exceeded_always_false_for_non_budget_kind(user, account, category):
         owner=user, name="Pago", kind=Goal.KIND_PAYMENT, category=category, target_amount=Decimal("10"),
     )
 
-    assert goal.progress() > goal.target_amount
+    assert goal.progress > goal.target_amount
     assert goal.is_exceeded() is False
 
 
@@ -103,7 +103,7 @@ def test_saving_goal_progress_equals_account_balance(user):
         owner=user, name="Ahorro", kind=Goal.KIND_SAVING, account=acc, target_amount=Decimal("1000"),
     )
 
-    assert goal.progress() == acc.current_balance()
+    assert goal.progress == acc.current_balance()
 
 
 def test_bar_width_caps_at_100_above_target(user):