Not much else to say... All LDAP interaction is noticeably slower, from logging in to moving messages between folders.

Configuration options:

./configure --prefix=/usr --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --build=i686-pc-linux-gnu --with-ldap --disable-ipv6 --without-pam --with-ssl=openssl --without-vpopmail --sysconfdir=/etc/dovecot

-Ben