There is one problem that you can run into with adding chained switches/hubs to a network, probably is not an issue here. It occurs when on large networks where the time (including latency of the chained devices) for a packet to move end to end exceeds the retransmission delay for a collision. Stations on opposite ends of the cable will not see the collision and thus both transmit at the same time. The fix is a real router in the middle and proper sub-netting to define the collision domain to be each segment.

Also, even though it was written in the mid 90's do a seach for an article called "It's the Latency Stupid", since the principles still apply to all network devices and is one more reason for network performance issues.

About me:
8 years of network support
7 years IT field service

Always looking for the next project to be done.