I have a set of CoS objects I am importing in and their add times are extremely slow about 1 a second. There are about 500k objects in the directory currently and its broken down in a hierarchical format. A simple ASCII drawing would be. ou=top | - ou=First | + ou=Second | + cn=Final This is representation of the data but for ease of explanation this should work. There are lots of "First" object and they have the possibility of lots of "second" objects. Its the also the same for "Second" object they could have a lot of "Final" objects. The idea is to use CoS at the First and Second level to reduce the amount look ups and redundant data as final objects need some info from the second objects and first objects. Hopefully I explained that in a way it is easy to understand. My question is are CoS objects not supposed to be used this way? Also are lots of CoS objects used in a hierarchical tree this way bad? Is there a way to make these imports faster? And last am I just doing something completely wrong and there is a better way that I should work to my end goal. Thanks Edward