Thank you so much for the quick reply.
But am no where using .CPD files. I am just modifying the existing help files and trying to generate the process. And it is taking more than 30 minutes of time.
Did you actually try Colum's suggestion of resetting the .CPD file inside RH? You don't mention if it had any effect on your issue. I would also ask, has anything changed since you last compiled with times of 5-10 minutes?
Jeff, it would seem that Madhu is perhaps confused about .CPD files, as it was stated "no where using .CPD files".
Madhu, the .CPD file is a file created and used by the RoboHelp HTML application. Sometimes we need to rename or delete it in order to coax a project to work again. In Tools > Options there is a setting to delete the .CPD when RoboHelp HTML starts. You might try enabling that option and see if things change for you.