Manual iPhoto photo deduplication? Looks like failure again.

Deleting manually duplicates from iPhoto seems to be a very time consuming process as for some reason iPhoto does a lot of IO to go through some process before actually deleting the pictures, some 10 minutes for 400.

The firewire 800 drive does really not help.

Actually the Photo deletion is quite quick, i.e. the photos appear immediately in the trash, but the library update takes a while even for 153 photos in 10 events somewhere around 5 minutes.