The performance of GigE Vision camera changes depending on pefromance/setting of network board/port.
The performance of GigE Vision camera is stable when one GigE Vision camera connecting to one network port.
Please adds extend network board if it is necessary.
Please use Gigabit Ethernet (1000Base-T) supports network switch when there are some configuration limitation such as extend network board cannot insert to PC or limitation fo number of cable due to cabling limitation.
Gigabit Ethernet (1000Base-T) supports network switch can be used when total amount of data from GigE Vision cameras is less than 1Gbps with trigger operation.
Please check on actual environment when using network switch, because performance is different each manufacture and model.