You may be able to improve performance by increasing the value of the RECORDLENGTH parameter when you start a direct path Export. Your exact performance gain depends upon the following factors:
DB_BLOCK_SIZE
The types of columns in your table
Your I/O layout (The drive receiving the export file should be separate from the disk drive where the database files reside.)
The following values are generally recommended for RECORDLENGTH:
Multiples of the file system I/O block size
Multiples of DB_BLOCK_SIZE
An export file that is created using direct path Export will take the same amount of time to import as an export file created using conventional path Export.