Maximum monitored hosts and services?

[magic_rooter]

Hello everybody!
I have performance problem now
There are 5700 hosts and  7058 services in my nagios. Server-RHEL3,
Nagios 2.5,8gb RAM,8 CPUs.All checks are active. Hosts checks
disabled.
Performance is awful! It can't perform all checks for an hour! When I
had 3000 services the performance was great-all tests made in 5 min.
Our environment increases fastly. So, I want to know how many services
nagios can perform maximally in 5 min?
I made tuning of nagios. All performance tips from docs and inet.
But now I see that nagios works bad when it has 7000 service checks.
Maybe version 3.0 will solve my problems?

Help me please!:( I am in despair.

Kristine

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