If “Page Splits” is high and your application is inserting values into an allpages-locked table with a clustered index on a compound key, it may be possible to reduce the number of page splits through a special optimization that changes the page split point for these indexes.
The special optimization is designed to reduce page splitting and to result in more completely filled data pages. This affects only clustered indexes with compound keys, where the first key is already in use in the table, and the second column is based on an increasing value.
