twb suggested on IRC that I mention my experience with converting to 
darcs 2.

The repository is not public, unfortunately, but I'll try to make a 
useful report.

I'm running darcs 2.1.0 on ubuntu 8.10, 32-bit, Athlon 3200+, firefox 
eating about 30% of the cpu :)

The v1 repo:
   1800 patches
   du -h _darcs/patches = 29M
   du -h = 71M
   find -type f | grep -v _darcs = 1228 files (currently)
   darcs show tags = 37 tags, most of them recent

darcs convert:
   43.79s user 7.01s system 48% cpu 1:45.32 total
   grep lossy conv.log = 58 lines of "lossy conversion of complicated 
conflict"!
   grep merger conv.log = 87 lines
   wc -l conv.log = 1783 lines


I don't know what's being lost, but it seems like it happened a lot. 
And, the v2 repo doesn't seem faster for the simple operations I've 
tried so far. There are no diffs in either repo; everything is local 
disk; times are best-of-3:

darcs wh         v1 3.1sec  v2 4.0sec
darcs wh -sl     v1 6.1sec  v2 9.3sec  (why 2x as long?)
darcs mv foo bar v1 3.8sec  v2 6.0sec

I'll probably leave this project on v1 :)

cheers,
drew
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