Hubs will always have collisions. Excessive collisions may be due to bad hub, NIC’s or too long cables. A hub network is Carrier Sense Multiple Access/Collision Detection. You can make this network more efficient by replacing the hubs with switches. Note that the users will receive much better throughput using a switch also since it is full duplex rather than half-duplex like the hubs.
Short answer: Lose the hub, get a switch…
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