diff --git a/defaults/main.yml b/defaults/main.yml
index 2ae94ba..58aa4bc 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -22,6 +22,10 @@ postgres_arguments:
   - -c
   - max_connections=256
   - -c
+  - shared_buffers=47616MB
+  - -c
+  - effective_cache_size=142848MB
+  - -c
   - maintenance_work_mem=2GB
   - -c
   - checkpoint_completion_target=0.9