[eluser]tonanbarbarian[/eluser]
Technically it will slow you down
Because to load in CI requires you to call a seperate function i.e. $this->load->view
Each function call you make takes a toll on the performance
Also to make sure that data is available in the view it must be extracted before the view file is included.
however on the plus side once you start to use CI you can take advantage of its cache which can improve performance