Checking the workstation's network configuration settings would be the best initial step, as incorrect settings could lead to performance issues such as an improper IP address, subnet mask, or DNS server information, which could slow down or misdirect network traffic from the workstation to the rest of the network. Switching to a different port would not address potential configuration issues on the workstation. Updating the network drivers may resolve some issues, but it is more appropriate to check if configuration settings are correct before proceeding to update drivers, which may not be necessary if the settings are the cause. Replacing network cables as an initial step should only be considered if there is a strong indication of physical damage or failure, which is not mentioned in the scenario.