diff --git a/bookwyrm/models/status.py b/bookwyrm/models/status.py
index ee138d979..1368e05e4 100644
--- a/bookwyrm/models/status.py
+++ b/bookwyrm/models/status.py
@@ -3,6 +3,7 @@ from dataclasses import MISSING
 import re
 
 from django.apps import apps
+from django.core.cache import cache
 from django.core.exceptions import PermissionDenied
 from django.core.validators import MaxValueValidator, MinValueValidator
 from django.db import models
@@ -373,6 +374,11 @@ class Review(BookStatus):
     activity_serializer = activitypub.Review
     pure_type = "Article"
 
+    def save(self, *args, **kwargs):
+        """clear rating caches"""
+        cache.delete(f"book-rating-{self.book.parent_work.id}-*")
+        super().save(*args, **kwargs)
+
 
 class ReviewRating(Review):
     """a subtype of review that only contains a rating"""
diff --git a/bookwyrm/templatetags/bookwyrm_tags.py b/bookwyrm/templatetags/bookwyrm_tags.py
index a3e89d9e5..6e4e8d840 100644
--- a/bookwyrm/templatetags/bookwyrm_tags.py
+++ b/bookwyrm/templatetags/bookwyrm_tags.py
@@ -13,10 +13,15 @@ register = template.Library()
 @register.filter(name="rating")
 def get_rating(book, user):
     """get the overall rating of a book"""
-    queryset = models.Review.privacy_filter(user).filter(
-        book__parent_work__editions=book
+    return cache.get_or_set(
+        f"book-rating-{book.parent_work.id}-{user.id}",
+        lambda u, b: models.Review.privacy_filter(u)
+        .filter(book__parent_work__editions=b)
+        .aggregate(Avg("rating"))["rating__avg"],
+        user,
+        book,
+        timeout=15552000,
     )
-    return queryset.aggregate(Avg("rating"))["rating__avg"]
 
 
 @register.filter(name="user_rating")