Active Dir. connector: Can you give an example of how to use the ADContainer parm?

We have the AD connector working fine but want to improve the response time when searching for a name ... There are appear to be 2 parameters we could use: IgnoreOU (what is the syntax if one wants to have more than one) and ADContainer (what is the syntax... can you show an example as it relates to a specific part of the DN= ???

Thank you!