[horde] datatree is too large

[Rong-En Fan]

hello,

my horde/imp runs very slow in recently days. and mysql is running
very hard. I found that most mysqld are sorting results from
datatree* tables and those table are very large (datatree contains
580,000 entries). Is there any possible way to solve this?

my Horde, imp, turba, ingo, kronolith are July 23's CVS HEAD
mysqld is 4.0.21 running on localhost
CPU is Dual P4 2.8G and 3G ram

Regards,
Rong-En Fan