Optimal Config for hundreds of passive checks

[solo molo]

I have nagios running on redhat 8.0 on a compaq DL360 with dual 800mhz procs 
and 1GB ram.  Nagios receives 400 passive check results every 10 minutes and 
another 100+ active checks are perfomed every 5 minutes.  My loads are never 
very high, but nagios gets way behind on processing the passive checks.  The 
problem is especially bad when some of the passive checks return critical 
results.  I've seen the delay as bad as 20 hours.  That is when I check the 
log, nagios is receiving current passive results, but displaying results 
from 20 hours ago in the UI.  I'd appreciate any suggestion as to how I can 
configure nagios to process the passive results more quickly.  I'm using the 
following config:

inter_check_delay_method=d #I can't use smart because I have a few checks 
that only run once every 24 hours and throw off the average.

service_interleave_factor=s
max_concurrent_checks=0
service_reaper_frequency=5
sleep_time=1

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