My clients which have a wireless connection when try to connect to a domain, its make a long time to resolve user name and passwords. What should I do ?

At the command prompt of one of your wireless connected computers, run IPCONFIG /ALL and look at the network properties for your wireless adapter.

Is it getting the network information from your DHCP server? DNS?

Or is your wireless access point also acting as a DHCP server that is not providing the same information and services as your other DHCP servers?

If you have another DHCP server, is the scope overlapping with other devices that have been assinged Fixed addresses?