Nested attribute UJS on a big number of records

gistfile1.rb

#Artist Model

class Artist < ActiveRecord::Base

  has_many :performers, :dependent => :destroy
  has_many :musics, :through => :performers

  #default_scope order(:name)

  def self.find_ordened_artists
    Rails.cache.fetch('artists/ordened') { self.select('id, name').order(:name).all }
  end

  def self.destroy_ordened_artists
    Rails.cache.delete('artists/ordened')
  end
end

#Music Model

class Music < ActiveRecord::Base
  has_many :performers, :dependent => :destroy

  has_many :artists, :through => :performers
  accepts_nested_attributes_for :performers, :reject_if => lambda { |p| p['artist_id'].blank? },:allow_destroy => true

end

#Music Controller - new action

def new
  @music = Music.new
  @performers = @music.performers.build
end

#Music _form Partial

<%= form_for [:admin,@music], :class=>"form-inline" do |f| %>
<%= f.error_messages %>
...
<div class="well" id="performers">
<h4><%= t('misc.artist.other') %></h4> 
    <p>
      <%= f.fields_for :performers do |performer_form| %>
          <%= render 'performer_fields', :f => performer_form %>
      <% end %>
      <span class="label label-success">
        <i class="icon-plus icon-white"></i>
          <%= link_to_add_fields t(:add) + t('misc.artist.one'), f, :performers %>
      </span>
    </p>
</div>
....
<% end %>

# perfomer_fields partial

<div class='fields'>

     <div class="clearfix">
        <%= f.label :artist_id, t('misc.artist.one'), class: 'label'  %>
            <div class="input">

              <%= f.collection_select :artist_id, Artist.find_ordened_artists, :id, :name ,:prompt => 'Selecionar Artista' %>

            </div>
    <span class="label label-important">
       <i class="icon-remove icon-white"></i>
      <%= link_to_remove_fields t(:remove)+ t('misc.artist.one'), f %>
    </span>
    </div>
    <hr />
</div>

#ApplicationHelper link_to_add_filds method

  def link_to_add_fields(name, f, association)
    new_object = f.object.class.reflect_on_association(association).klass.new
    fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
      render(association.to_s.singularize + "_fields", :f => builder)
    end
    link_to_function(name, ("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")"))
  end

#Application.js add_fields

function add_fields(_2,_3,_4){
    var _5=new Date().getTime();
    var _6=new RegExp("new_"+_3,"g");
    $(_2).parent().before(_4.replace(_6,_5));
};