Optimizations to reduce the memory footprint of your document.
Optimizations may include amongst others:
Aggregating away the detail rows in your script - managers often don't want to see the details, operational people need only specific operations details etc.
Reducing the complexity of your data model - a star of snowflake layout with a single facts table is preferred
Reducing cardinality (# of distinct values) in all fields
Splitting your document in functional units, business-wise.
