Why domain-controlled client logon to a domain-controlled server is slow

Present situation:

Domain Control server: winserve2008 R2

Client: SDWM Win7 64-bit

SDWM XP

*win7 64-bit, same account, login for a few minutes, XP only need a few seconds

Possible causes: 1, Server DNS settings error (normal should point to server native) =〉 that's not the problem.

2, client DNS settings error (should point to DNS server) =〉 this is not the problem.

3, the client system problem =〉 immediately solve the login problem

Processing: Replace the Win7 64-bit system with a genuine 32-bit system,

Reason: May be 64-bit D version of excessive deletion caused.

Why domain-controlled client logon to a domain-controlled server is slow