Module to manage lots of blocks Any module to manage lots of blocks?
Since the block page is so huge to load.
Or any other methods to manage lots of custom user defined content expect node.
Try the Context module. 


  Context allows you to manage contextual conditions and reactions for different portions of your site. You can think of each context as representing a "section" of your site. For each context, you can choose the conditions that trigger this context to be active and choose different aspects of Drupal that should react to this active context.
  
  Think of conditions as a set of rules that are checked during page load to see what context is active. Any reactions that are associated with active contexts are then fired.