Hi Shiela,
Are you doing a Full load or Delta Load, If its a Full Load, Are you deleting the complete cube content and Reloading it?. If so, You should not delete the Dimention table content, else it will regenerate the DIMID in every load.
Also try to do number range buffering for the dimentions tables and for the Infoobjects. so that the DIMID and SID generation will be faster.
Regards,
Muruganand.K
