Optane 4K performance within Hyper-V clients

I got a question about SSD performance of Hyper-V clients.

I used an Intel 900P 280GB drive as the storage for two Hyper-V clients, both running Windows 10 Pro 1809. If I only power one of them on, and I use CrystalDiskMark 6 to test the disk performance, the Q1T1@4K (Queue 1 Thread 1@4K) result (the one that made
all the difference with Optane) will be only Read:110MB/S Write:105MB/S, but if I test the same drive in the host system, the result will be Read:235MB/S Write:225MB/S.

I tried different platform, and the result is identical, the disk performance of clients are seemingly limited at 110MB/S.

I managed to set up the entire 280GB drive to direct pass through as a SCSI drive for one client, and the disk performance is still like above, halved the test result within host system.

The sequential read and write performance is the same for clients and the host, but that does not make the biggest impact on the smoothness of the system. I wonder if there are some tweaks to change this.

My host system configuration is: AMD Ryzen 2600, 8-core, 64GB DDR4 2666Mhz, Intel 900P 280G NVME

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