844b2040_Apache_tm__FOP__Configuration__Description
[Element] use-cache [Data Type (for the value)] boolean (true, false) [Default Value] true [Description] 
All fonts information that has been gathered as a result of "directory" or "auto-detect" font configurations will be cached for future rendering runs. This setting should improve performance on systems where fonts have been configured using the "directory" or "auto-detect" tag mechanisms. By default this option is switched on.
Apache(tm) FOP: Configuration
Description