gistfile1.txt

models
------
class Bookmark

  referenced_in :user
end

class User

  references_many :bookmarks, :dependent => :destroy
end


index.slim
----------
@bookmarks.each do |bookmark|
  ...
  = bookmark.user.username
  ...


beta.20 log
-----------
(repeated at least 50 times)
truffls_development['bookmarks'].find({"$or"=>[{:private=>false}, {:private=>true, :user_id=>BSON::ObjectId('4d16ae21a46a2d600b000005')}]}, {}).limit(50).sort([[:created_at, :desc], [:updated_at, :desc]])
truffls_development['users'].find({:_id=>BSON::ObjectId('4d16ae21a46a2d600b000005')}, {}).limit(-1)


beta.20 response time
---------------------
Completed 200 OK in 291ms (Views: 276.6ms)


rc.4 log
--------
(repeated at least 50 times)
truffls_development['bookmarks'].find({"$or"=>[{:private=>false}, {:private=>true, :user_id=>BSON::ObjectId('4d16ae21a46a2d600b000005')}]}, {}).limit(50).sort([[:created_at, :desc], [:updated_at, :desc]])
truffls_development['users'].find({:_id=>BSON::ObjectId('4d16ae21a46a2d600b000005')}, {}).limit(-1)
truffls_development['bookmarks'].find({"user_id"=>BSON::ObjectId('4d16ae21a46a2d600b000005')}, {})
MONGODB cursor.refresh() for cursor 6223321165071467073


rc.4 response time
------------------
Completed 200 OK in 14728ms (Views: 14714.9ms)

Thanks for this... Can you try pointing at master and see if that helps it? I expect the relational stuff in the rc's to be slightly slower, but this is ridiculous... I did make a commit that should help this out at:

mongoid/mongoid@6e4df4d

master is freaking fast!

Completed 200 OK in 214ms (Views: 197.7ms)

Ok that's a weight off my chest... Thank you very much for providing the gist.