In my samba server (3.2.5-4lenny13) I have problems of slowness in some files. Let me explain: A word file of 155Mb when the user is the owner takes about 7 seconds, but if the user is not the owner takes about 40 seconds (WAN). I have monitored with wireshark and when the user owns is a 4096 bytes/frame and when the user does not own is a 512 bytes/frame. I have worked with this option: kernel oplocks = no Why do ocurreo this? My smb.conf [Global] workgroup = domain realm = domain.com preferred master = no server string = Samba security = ADS encrypt passwords = yes password server = activedirectory.domain.com domain master = no encrypt passwords = yes SO_KEEPALIVE TCP_NODELAY socket options = SO_RCVBUF = 8192 SO_SNDBUF IPTOS_LOWDELAY = 8192 dns proxy = yes log level = 3 syslog = 0 log file = / var / log / samba /% m max log size = 50 winbind enum users = Yes winbind enum groups = Yes winbind use default domain = Yes winbind nested groups = Yes idmap uid = 600-20000 idmap gid = 600-20000 read raw = yes write raw = yes oplocks = yes max xmit = 65535 getwd cache = yes * **kernel oplocks = no* [share] comment = myshare path = /opt/data/ public = no writable = yes browseable = yes create mask = 770 directory mask = 770 force create mode = 0770 force group = group_quota