Codeigniter plus Doctrine

[eluser]Pascal Kriete[/eluser]
It depends on your needs. CI works fine without Doctrine - and adding a layer of abstraction does mean slightly reduced performance. If you feel that your app will be better with ORM, by all means use it. Once you have it figured out it'll probably increase productivity a bit.
Remember to turn off active record (in the database config file) if you do decide to use it. Just to conserve some memory .