I worked on a database for a close friend of mines who happen to own 5 imacs within an office. All of them are the late 2012 model. They do not want to host the database online since it will mostly be used internally. I noticed the network sometimes becomes slow or sometimes it drops so the database would lag a bit. Is there any possible way to improve the connection?

I have forwarded the port to bring the database "online" and the response time is improved greatly but this only works when accessing it from outside of the network. Not unless anyone else have any suggestions?

Currently they are using a netis router. I think there was a way to improve the localhost to make it more reliable but I just cannot think of any solutions at the moment.