What do you exactly mean by poor performance. How many machines are in this cluster? What is the configuration of them CPUs, RAM, space. How many OSs are you scaning. Your question is very general.
There are 4 machines in the cluster, each machine has: 12 * Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz, 64GB mamory, 64GB swap and 3TB space. The OSI number is 38K. The poor performance means very slow responding on the web UI, especially when there are consolidation process running, very frequently the web UI is not responding for 5 to 10 minutes when just reload a page.
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That would tend to indicate either your machines or I/O is very busy. Have you looked at the performance information?