socket options is one possible optimization provided with the sample configuration that ships with your Samba version. Its default configuration refers to a local ethernet network. For additional information about socket options, refer to the relevant section of the manual pages of smb.conf and to the manual page of socket(7). Further information is provided in the Samba performance tuning chapter of the Samba HOWTO Collection.
The standard configuration in /etc/samba/smb.conf is designed to provide useful settings based on the default settings of the Samba team. However, a ready-to-use configuration is not possible, especially in view of the network configuration and the workgroup name. The commented sample configuration examples/smb.conf.SuSE contains information that is helpful for adaption to local requirements.
The Samba HOWTO Collection provided by the Samba team includes a section about troubleshooting. In addition to that, Part V of the document provides a step-by-step guide to checking your configuration.