HPUX 10.20 and Informix

We recently upgraded from hpux 9.04 to 10.20 and informix 7.11uc1 to 7.23uc1. Everything has been working fine however our level 0 archives are taking substantially longer...2+ hrs going to a DLT 2000 tape drive. All informix parms / tapesize/tapefile blk size are the same and the database hasn't grown that much. Does anyone have any experience with dlt2000's in a similar situation or any ideas about how to increase the archive times? I suspect something is different with the device drivers in hpux but cannot put my finger on it yet.. help appreciated.. Tks Ed edbid @ cobe.com