DID try 12.1 quite a lot and was terribly disappointed.
Reformated harddrive and reinstalled 11.4 - and HAPPY!
11.4 has GNOME 2 - Now THAT's a GREAT UI.
(At least when seeing the alternatives)
Or just by file size first, then do a hash. No need to compute a hash to compare a 1mb file and a 1kb file.
thats exactly right.
Some time ago (years?) I came across a little book called "wicked cool perl scripts" (do a google shure you find it..) In one of the first chapters there is a script that does exactly what you describe (dupfiles.pl if I remember right):
To find duplicate files it goes down the directory hierarchy, sorts the files by size and does a md5sum comparison of files with similar size.
I tried it out once in awhile and it always worked out very well for me.
The scripts themselves can be downloaded from the publishers website. Have a look if your interested -
(btw. I do not have any commercial interests in this recommendation..)