warn/error after enabling network tests. + scantimes

[Diego Pomatta <in...@abelsonsa.com.ar>]

Hello list.
I want to start using URIBL tests, so I added

urirhssub       URIBL_BLACK  multi.uribl.com.        A   2
body            URIBL_BLACK  eval:check_uridnsbl('URIBL_BLACK')
describe        URIBL_BLACK  Contains an URL listed in the URIBL blacklist
tflags          URIBL_BLACK  net
score           URIBL_BLACK  3.0

urirhssub       URIBL_GREY  multi.uribl.com.        A   4
body            URIBL_GREY  eval:check_uridnsbl('URIBL_GREY')
describe        URIBL_GREY  Contains an URL listed in the URIBL greylist
tflags          URIBL_GREY  net
score           URIBL_GREY  0.25


...to my local configuration (as instructed in 
http://www.uribl.com/usage.shtml), and removed the -L switch (local 
tests only) to spamd startup,
and a warning appeared with each incoming mail:

warn: Use of uninitialized value in pack at 
/usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi/Net/DNS/Question.pm 
line 172.

Is that anything to worry about? How can I solve it?
I realize Perl version (5.8.1) is not the newest. Haven't got around to 
updating it.
By the way, I disabled SA's URIDNSBL plugin in init.pre. It would be 
redundant, somewhat, right?

The other question is, where can I see a list of all the network tests 
that SA can perform, or performs by default?
I ask this because the only network tests I want are URIBL and Spamhaus, 
and Spamhaus checks are done by rblsmtp before SA or qmail get their 
hands on mail.
After enabling network tests the scan times went from less than 0.5 sec. 
per mail, to 3-5 seconds (sort of unacceptable, to me) and that's 
without DCC, Pyzor, Razor2, clamav and SpamCop.

Setup is SA 3.2.4 <-> simscan <-> qmail.
Thanks in advance for any help.
Regards.
/Diego