Windows 11 only has 45% of random write speed in Nvme SSD

Question

As you see above, the other performance is about the same, but in RND 4K Q32 T16 the speed has dropped significantly. I know that because the two software versions are different and the condition of the computer is different, it is normal for the performance to fluctuate, but this performance also dropped too much, and the performance remained stable low after many tests at different times.

Answer 1

Hi MJ,

I am Sumit here to assist you with this question.

I encourage you to add a response in the first reply below where a Microsoft Engineer asked for more details regarding a similar issue.

https://www.reddit.com/r/Windows11/comments/piz...

Disclaimer:
The link included is a non-Microsoft website that would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.

Edit:

Also make sure you have installed the optional update:

November 22, 2021—KB5007262 (OS Build 22000.348) Preview (microsoft.com)

• Addresses an issue that affects the performance of all disks (NVMe, SSD, hardisk) on Windows 11 by performing unnecessary actions each time a write operation occurs. This issue occurs only when the NTFS USN journal is enabled.  Note, the USN journal is always enabled on the C: disk.

Answer 2

For me random write iops are only 12% of what they should be and random read iops are only 65%. This is on an AMD Threadripper system with Phison based drives. Intel Optane 905p is unaffected and I assume its due to the fact it uses its own nvme driver.

Answer 3

I have a similar issue with my Samsung 980 Pro, as you can see in the image, read/write sequential is pretty much normal/same as W10, and even random reads, but random writes IOPS tanked to half:

Answer 4

Slight increase (over prior Win 11 builds) with latest official build/release of Windows 11 by the way (build .348). Maybe 10% improvement. But still way down from Windows 10 performance -- so something is still not quite right with Win 11 and NVMe SSD random write performance.

Answer 5

I noticed the same drop in performance on my Samsung 980 Pro on the Random Write IOPS. Rest of the performance stats are the same.

Maybe my scenario will help Microsoft debug this. Because I had this working on Windows 11 properly with about 800k IOPS for Random Write.

1. I upgraded Windows 10 to Windows 11 still on my Adata XPG SX 8200 Pro 1TB PCIe 3.0 nvme SSD.
2. I than with Black Friday bought a Samsung 980 Pro 2 TB PCIe 4.0 nvme SSD.
3. I moved my Adata to my second M2 slot on my B550 motherboard. And put the Samsung in the first M2 slot, directly linked to the CPU.
4. Initial benchmark showed 800k Random Write IOPS on Windows 11.
5. I than cloned the Adata drive to the Samsung drive. And booted Windows 11 from the Samsung drive, all still fine here and still 800k Random Write IOPS.
6. I decided I wanted a clean install of Windows 11 instead of an upgrade. Therefor I did a clean install on the Samsung drive.
7. After the clean install, installing all drivers and such. Benchmark shows the same as image above. Sequential Read and Write still the same original speeds, Random Read IOPS still at 980k IOPS. However, now my Random Write IOPS have dropped from 800k to just 290k IOPS. That is a massive 60% drop in performance for Random Write. This is a clean install of Windows 11 so not much what can cause this issue in terms of programs or utilities. All drivers are up to date and so is Windows running version 2200.348