Dup File Finder vs Dup Cleaner 206

dupfinder_35 aka duplicate file finder (Brooks Younce)

very basic interface, drag & drop folders to search.
can edit the file types, mask (generally)
can do a "Fast" Search (less accurate) that reads 1st & last 10 MB of file.
- seems to be VERY quick ... /sometimes/

interface is not much, & that's the problem.

searching R:\music\*, in fast mode, took 24:31:38 used about 20 MB RAM, cpu
a bit variable, but minimal < 10%.  there was r/w IO throughout, whatever
that means.

so now i've got the list ... & ... & 3413 duplicate files (thinking most
will be jpg's, that i should have filtered out, only including mp3's, but
oh well) searched 78892 files in 378 GB of space, with 10 GB wasted (what-
ever that means, maybe dups?)

now with cleaner 206 ... same content, byte-by-byte, music tags excluded.
50 MB RAM ... 78974 files, 379 GB (so those numbers agree) ...
3103 duplicate groups, 6558 duplicates (20.2 GB) & it took ... 11:58.21
(oh look, 206 ALSO records the time taken in its summary & that agrees TOO!)

towards the end, CPU may have varied ~15% & MEM ~70MB, but nothing so terrible.

so... 206 took MUCH LESS TIME & has MUCH better interface !!

now with 206 & MD5 ... same exact numbers except time was 9:28.96 vs. 11:58,
so ~2.5 minutes quicker yet.  CPU about the same, MEM ~80MB, so more yet, but
nothing too spectacular.

& now with 206 & SHA1 ... EXACTLY THE SAME, time 9:23 (so same +- 6 seconds!)
98 MB RAM, so that was higher.  didn't catch the CPU %?

finally 206 & SHA512 ... CPU is higher, hitting close to 25%.  mem so far is
only ~60 MB, ending up at 76 MB.  other numbers exactly the same, time 17:06,
so far more costly timewise compared to MD5/SHA1.

& dupfinder again ... (just in case "caching" makes a difference) ... perhaps
the same, 24 minutes, but i lost track (of time) so i'll try yet again, this
time without "Fast" ... 35:27.32, so worse yet.

FOR MUSIC, DFF35 IS A *FAIL*

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different for S2 etc. aka larger video/clips

DFF dups 121, searched 11339, space 253 GB, wasted 1.48 GB, 41.71 sec, not Fast mode.

DFF w/FAST same exact results, but only 8.8 seconds, so HUGE diff vs not Fast.

206, dup groups 119, scanned 11348 (253 GB), 248 dups (2.96 GB), 40 sec b-2-b

206 w/SHA1 same exact results, 47 sec, so, *slower* then b2b & cpu was 25%
(also app "seemed" to disappear from taskbar till scan completed)

206 w/MD5 (ditto the "disappear"), again 47 sec, though CPU only ~10%