Forest trusts

For testing I have created a new forest with two way transitive trust to my
domain.
I want production users to gain access to all test machines and servers in
the test domain.
Problems I have; takes very long time to logon to the test domain, joining a
test machine to the test domain takes long time, test domain resources are
not available. When I try to validate test forest I get error that no logon
server available in the test.domain
Here are some technical information
Both forests run Win2k3 R2 DCs
All, test and production, forest s machines are in the same subnet. Example
192.168.1.x
One DHCP in production forest provides IP for all machines including test
forest. DNS server of test domain is provided to DHCP clients