How To Fix Slow Write Speed of Toshiba SSD on the Dell XPS
Dell XPS 13

I recently purchased a Dell XPS 13 Touch configured with a 512GB PCIe SSD. It wasn’t until I used Visual Studio 2015 to deploy a database project that I noticed extremely slow write speeds. It took 30 agonizing minutes to publish a database that should have only taken 3 minutes. I was pretty frustrated with this experience, especially since this is a brand new high-end laptop.

After some searching, via Google, I found out that some of these laptops come with a Samsung SSD, and others have a Toshiba SSD. To make matters worse, I was reading that the Toshiba was supposed to be faster than the Samsung SSDs configured in these machines.

It turns out that a feature called Windows write-cache buffer flushing was the culprit for the sluggish write speeds. Turning this feature off gave me much more acceptable write speeds.

I tried several other suggestions I found before running into this tidbit of information and none worked but this one.

To turn off Windows write-cache buffer flushing:

  • Open Device Manager
  • Expand disk drives
  • Right click on the disk NVMe THNSN5512GPU7 NV (in this case) and click Properties
  • Click the Policies tab and make sure both available options are checked

Open Windows Device Manager

Disk Policies

Before (abysmal write speed):

Before: Slow Write Speed

After (much better write speed):

After: Better Write Speed