FreeBSD 9.0-RC1+ZFS+Samba3.5+AD slow working

WITH_LDAP=true
WITH_ADS=true
WITHOUT_CUPS=true
WITH_WINBIND=true
WITHOUT_SWAT=true
WITHOUT_ACL_SUPPORT=true
WITHOUT_AIO_SUPPORT=true
WITHOUT_FAM_SUPPORT=true
WITHOUT_SYSLOG=true
WITHOUT_QUOTAS=true
WITHOUT_UTMP=true
WITHOUT_PAM_SMBPASS=true
WITHOUT_DNSUPDATE=true
WITHOUT_AVAHI=true
WITHOUT_EXP_MODULES=true
WITH_POPT=true
WITHOUT_IPV6=true
WITHOUT_MAX_DEBUG=true
WITHOUT_SMBTORTURE=true

#======================= Global Settings =====================================
[global]
workgroup       = DOMAIN
server string   = ZFS FreeBSD file server
netbios name    = BSD-zfs
security        = ads
auth methods    = winbind

hosts allow     = 192.168.10.0/24 127.0.0.1/32
smb ports       = 445

load printers   = no
show add printer wizard = no

log file        = /dev/null

max log size    = 128

password server = 192.168.10.1

realm           = domain.local

passdb backend  = tdbsam

socket options  = TCP_NODELAY SO_KEEPALIVE SO_RCVBUF=32768 SO_SNDBUF=32768
getwd cache     = yes
use sendfile    = true

interfaces      = 192.168.10.8/24

local master    = no
os level        = 33
domain master   = no
preferred master        = no
domain logons   = no

winbind use default domain      = yes
winbind uid     = 10000 - 15000
winbind gid     = 10000 - 15000
winbind enum users      = yes
winbind enum groups     = yes
winbind separator       = +
winbind cache time      = 300
winbind offline logon   = yes
winbind refresh tickets = no

wins support    = no
wins server     = 192.168.10.1
wins proxy      = no

dns proxy       = no

# Charset settings
display charset = utf8
unix charset    = utf8
dos charset     = cp866

# Solution for problem with symlinks on *NIX clients
follow symlinks = yes
wide links      = yes
unix extensions = no

# Use extended attributes to store file modes
store dos attributes    = yes

# Use inherited ACLs for directories
nt acl support  = no
inherit acls    = no
map acl inherit = no
case sensitive  = no

#============================ Share Definitions ==============================
[share]
        public  = no
        comment = Shared folder
        browseable      = no
        writable        = yes
        path    = /var/samba/Userdirs/%U
        force user      = "user"
        force create mode       = 0660
        force directory mode    = 0770

kern.coredump=0
kern.sugid_coredump=0
kern.nodump_coredump=1
debug.elf32_legacy_coredump=0
debug.elf64_legacy_coredump=0
debug.minidump=0

kern.ipc.somaxconn=32768
kern.maxfiles=800000
kern.maxfilesperproc=50000
kern.maxvnodes=2000000

[logging]
        default = FILE:/var/log/kerberos/krb5libs.log
        kdc     = FILE:/var/log/kerberos/krb5kdc.log
        admin_server    = FILE:/var/log/kerberos/kadmind.log

[libdefaults]
        default_realm   = DOMAIN.LOCAL
        clockskew       = 300

        ticket_lifetime = 85000
        dns_lookup_realm = false
        dns_lookup_kdc  = false
        kdc_req_checksum_type   = 2
        checksum_type   = 2
        ccache_type     = 1
        forwardable     = true
        proxiable       = true

        v4_instance_resolve     = false
        v4_name_convert = {
                host = {
                        rcmd = host
                        ftp = ftp
                }
                plain = {
                        something = something-else
                }
        }
[realms]
        DOMAIN.LOCAL = {
                kdc     = 192.168.10.1:88
                admin_server    = 192.168.10.1:749
                default_domain  = domain.local
        }
[domain_realm]
        .domain.local = DOMAIN.LOCAL
        domain.local = DOMAIN.LOCAL

[pam]
        debug = false
        ticket_lifetime = 36000
        renew_lifetime = 36000
        forwardable = true
        krb4_convert = false

[login]
        krb4_convert = false
        krb4_get_tickets = false

socket options = TCP_NODELAY SO_SNDBUF=131072 SO_RCVBUF=131072
use sendfile = no
min receivefile size = 16384
aio read size = 16384
aio write size = 16384
aio write behind = yes