man.output.quietly — Suppress filename messages emitted when generating output?
If zero (the default), for each man-page file created, a message with the name of the file is emitted. If non-zero, the files are output "quietly" -- that is, the filename messages are suppressed.
If you are processing a large amount of refentry
content, you may be able to speed up processing significantly by
setting a non-zero value for
man.output.quietly.