I'm gonna make a website with many applications running inside. Do you think that it's possible to use Drupal as a CMS and then change my applications into drupal Module? Or is it more flexible to create your own CMS? For the moment i'm developing with zend framework. Is it better for me to stick with it or do you think it's a gain of time to switch to drupal and develop the modules that i need?
I also heard that Drupal has some problem about speed...
Many thanks in advance for your answers. Cheers