Libre office doc to pdf conversation is very slow on centos6.5

Single page and only text included doc file’s conversation take about 60 seconds. Any idea how to make this export faster ?

export HOME=/tmp && libreoffice --headless --invisible --convert-to pdf:writer_pdf_Export --outdir /20150109/20150109/166957/09012015101903.doc

To address one of the prevalent issues, here… Since LO 5, I have invariably had trouble with dragging and dropping multi-lines of text within the same document - it would just hang before reaching the target. Today, I discovered that doing this makes it function perfectly again: go to

Tools > Options > Libreoffice Writer > View
and uncheck ‘smooth scroll’

It fixes that issue entirely. For the first time in three years, drag & drop works correctly; and I believe the scrolling is now ‘smoother’ as well.