More optimized and faster query for local public posts

Even faster with new index

app/models/post.rb

@@ -52,9 +52,10 @@ class Post < ApplicationRecord
   scope :all_public, -> { where(public: true) }
 
   scope :all_local_public, -> {
-    left_outer_joins(author: [:pod])
-      .where("pods.host is null") # local posts have no host in pods
-      .where(public: true)
+    where(" exists ( 
+      select 1 from people where posts.author_id = people.id
+      and people.pod_id is null)
+      and posts.public = true")
   }
 
   scope :commented_by, ->(person)  {