Darcs should index and/or cache its metadata so that commands such as 'darcs
changes [file]' and 'darcs annotate [file]' are fast.  These commands should run
near-instantaneously.

I have a large darcs repo (> 500 MB including a few binaries), and running
either of the commands means darcs uses 100% of the CPU and takes anywhere
between 5 and 10 minutes. It also happens to consume the better part of 2gig of RAM.

It should be noted that darcs-server and darcsweb are both essentially built on
top of those commands and would therefore benefit from having them sped up.

Sounds like a duplicate of issue124.  Please send your comments there or re-open
if not