Windows 11 drive slowdown bug is finally fixed (but apparently not for everyone)

Windows 11 running on a laptop
(Image credit: Microsoft)

Windows 11 has received a new cumulative update which applies some important fixes, including patching up some File Explorer problems, and tackling the big SSD and hard drive slowdown bugbear which has been looming over the OS for a long time now (at least, in theory the patch deals with it – more on that later).

Update KB5008215 has been released for Patch Tuesday and brings with it the new emoji previously seen in testing (including Clippy replacing the paperclip), along with a whole bunch of bug fixes, most of which were already present in November’s preview update.

That includes solutions for Bluetooth audio volume problems, and various glitches with File Explorer such as it crashing after closing a window, and problems with displaying shortcut menus.

The big fix, though, is the cure for the gremlin causing sluggish drive speeds for some users. As Microsoft notes, the patch “addresses an issue that affects the performance of all disks (NVMe, SSD, hard disk) on Windows 11 by performing unnecessary actions each time a write operation occurs”.

Those write slowdowns can cut drive speeds in half, or worse, going by previous reports, so this is a major spanner in the storage works, and it’s good to see the fix go live.

Windows Latest reports that the cumulative update fixes these drive-related problems in its experience, but on a cautionary note, we have seen a few reports on the likes of Reddit from users who say their drive is still slower than it should be under Windows 11, even after applying KB5008215. There are also satisfied users commenting on those threads, too, saying their performance has been improved after the update.


Analysis: New patch is a positive step forward, but there are still concerns here

The fix for the driver issue is obviously an important one, as the performance reduction is huge in some reported cases, which hardly puts the new operating system in a good light. While this patch seems to fix things for a good number of Windows 11 users affected by sluggish drive performance, there are folks out there reporting that it didn’t do them any good; and that must remain a concern.

The drive slowdown bug is an issue which has been around for a good while now, indeed it surfaced a few months ago before Windows 11 was even released, and this – plus some scattered reports of it still not being cured now, with the fix applied – clearly point to it being a seriously thorny problem.

Hopefully Microsoft will be able to finalize any fresh tweaks that need to be done soon enough, but given that the holidays are almost here, the software giant won’t be putting out a preview update late in December. In other words, it won’t be until January that we see any further movement on this issue.

Obviously it’s also useful to see some File Explorer issues cleared up as well, but it’s another point of concern exactly how much has gone wrong with these fundamental building blocks of the desktop on Windows 11, all adding to the perception of the OS having been released a bit too early.

Darren is a freelancer writing news and features for TechRadar (and occasionally T3) across a broad range of computing topics including CPUs, GPUs, various other hardware, VPNs, antivirus and more. He has written about tech for the best part of three decades, and writes books in his spare time (his debut novel - 'I Know What You Did Last Supper' - was published by Hachette UK in 2013).

Read more
Woman gaming on a computer at home
Microsoft finally fixes some of Windows 11’s most annoying problems with new patch
Angry businessman destroying his desk and laptop with a baseball bat
New patch for Windows 11 24H2 reportedly plays havoc with File Explorer, and some folks are claiming it's broken their PC
Angry business man screaming on laptop
Finding Windows 11 sluggish when you’re working with files and folders? You’re not alone – and it’s high time for Microsoft to sort out File Explorer
A man sitting at his computer desk on his desktop with his head in his hands, looking a little frustrated.
Windows 11 suffers more bugs in latest update, with the Start menu hit hard by some frustrating issues
Angry businessman destroying his desk and laptop with a baseball bat
I'm absolutely sick of Microsoft's Windows 11 24H2 update, as it's now causing Bluetooth and webcam issues
A person working through faxes.
Microsoft will still let Windows 11 users send a fax, should they ever want that
Latest in Windows
Microsoft Store logo on a blurred background
There's finally a fix for an annoying Microsoft Store bug that's older than Windows 11
Portrait of African-American teenage boy studying at home or in college dorm and using laptop, copy space
Windows 11’s Notepad gets AI-powered ‘Rewrite’ feature, but not everyone’s going to be happy about it
Copilot on a laptop
Microsoft quietly updates Copilot to cut down on unauthorized Windows activations
Windows fail
It looks like Microsoft might have broken Windows 11 24H2 again as performance plummets with Intel's latest CPUs
Windows 11 update with Task Manager menu
Microsoft is fixing Windows 11 Task Manager’s quirky reporting of CPU usage, and a much-wanted change for the lock screen is coming, too
Young woman using laptop, looking annoyed
Microsoft’s latest bit of nagging in Windows 11 might come from a good place, but it’s seriously annoying some people
Latest in News
WhatsApp
WhatsApp just made its AI impossible to avoid – but at least you can turn it off
ChatGPT vs Gemini comparison
I compared GPT-4.5 to Gemini 2.0 Flash and the results surprised me
Apple iPhone 16 Plus
Apple officially delays the AI-infused Siri and admits, ‘It’s going to take us longer than we thought’
The Meta Quest Pro on its charging pad on a desk, in front of a window with the curtain closed
Samsung, Apple and Meta want to use OLED in their next VR headsets – but only Meta has a plan to make it cheap
AMD Ryzen 9000 3D chips
AMD officially announces price and release date for Ryzen 9 9900X3D and 9950X3D processors
Google Pixel 9
There's something strange going on with Google Pixel phone vibrations after the latest update