You can try to change the SCSI controller from buslogic/LSI Parallel to LSI SAS. This will improve a bit the IO performance. Also, check another points, like memory reservation (reserve 100% of the RAM of the VM and remove all limits) and CPU limitation (no limits for CPU also). You can try to change the VM VMDK from one LUN to another, including to a local ESX disk to check if you have changes on the IO performance.
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