These numbers look fairly normal to me. But you should look at your CPU and network utilization. If they are not fully utilized may be it is possible to tune something.
Nodes are networked on 1 gigabit network.
I used htop and each core is running at about 40%
I used nload and it's averaging about 300 megabits in and out.
Also the jmeter client sending is at about 7% network useage.
So there's plenty of wiggle room.
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