cfdocument processing is very slow for text with RTL (Right To Left) direction

In my application an event gateway is used to generate PDF files (more than one lakh , 100000) for Arabic texts and English text. During this process we noticed that it is taking very long time to generate Arabic PDF files compared to English one. Say , when English PDF took few seconds Arabic PDF took few minutes.

Have any one came across the same issue ever ? I feel that when text direction is changed (from LTR to RTL) it might be taking some more time time to generate. Any thoughts or suggestions or help is greatly appreciated.

Also , we noticed that generating PDF for RTL texts is comparatively faster in CF16 than CF9. But ,at the moment , our client dont want to upgrade to CF16 from the existing CF9.