I wipe the CD clean beforehand if any visible indication of smudge. It usually results in more reliable rip faster than otherwise if smudged to start. if a CD is not clean and/or defective, it can take many rereads for DBpwoeramp to confirm a good read and things can take much much longer if in secure rip mode to assure maximum rip quality.
in some cases with CDs damaged beyond repair you have to bypass secure mode and let it do its thing faster unless you are willing to wait perhaps indefinitely. Often you will probably still be challenged to hear any problems just by listening if teh rip is not perfect as a result.
Bottom line is dbpwoeramp is very flexible in terms of assuring the most accurate rips possible in the best time possible once you learn how to use it.