The small slot optimization is not documented anywhere on our wiki. This should be captured in the IO Optimizations page. See .
BLZG-1596, the small slot optimization will be enabled by default.
To take advantage of this optimization, people need to configure indices with high scatter (OSP, POS for triples) to have relatively low branching factors. This will reduce the average size of an index page for those indices. The small slot optimization code will then tend to co-locate index pages on a single page in the backing store. This reduces the #of IOs and improves locality.
 https://blog.blazegraph.com/?p=751 (small slot optimization blog entry)