Faster

Update dnsbl_check plugin to latest version.
Update Maruku to latest version.
In the wiki_controller, only apply the dnsbl_check before_filter 
  to the :edit, :new, and :save actions, instead of all actions.
  This makes mundane "show" requests faster, but does not 
  compromise spam-fighting ability.

app/controllers/wiki_controller.rb

@@ -7,6 +7,7 @@ require 'resolv'
 class WikiController < ApplicationController
 
   before_filter :load_page
+  before_filter :dnsbl_check, :only => [:edit, :new, :save]
   caches_action :show, :published, :authors, :tex, :s5, :print, :recently_revised, :list, 
         :atom_with_content, :atom_with_headlines, :if => Proc.new { |c| c.send(:do_caching?) }
   cache_sweeper :revision_sweeper