Performance warning: replication was delayed while applying changes to the following object. If this message occurs frequently, ...

Performance warning: replication was delayed while applying changes to the following object. If this  message occurs frequently, it indicates that the replication is occurring slowly and that the server  may have difficulty keeping up with changes.  
Object DN: %1
  
Object GUID: %2
  
Partition DN: %3
  
Server: %4
  
Elapsed Time (secs): %5
  
  
User Action  
  
A common reason for seeing this delay is that this object is especially large, either in the size  of its values, or in the number of values. You should first consider whether the application can  be changed to reduce the amount of data stored on the object, or the number of values.  If this is  a large group or distribution list, you might consider raising the forest version to Windows Server  2003, since this will enable replication to work more efficiently. You should evaluate whether the  server platform provides sufficient performance in terms of memory and processing power. Finally, you  may want to consider tuning the Active Directory database by moving the database and logs to separate  disk partitions.
  
If you wish to change the warning limit, the registry key is included below. A value of zero will  disable the check.  
  
Additional Data  
  
Warning Limit (secs): %6
  
Limit Registry Key: %7