Devastating performance hit from KB4338825 update on AMD A9-9420 APU

For weeks I couldn’t figure out why my AMD A9-9420 based laptop bought in January 2018 became so horrifyingly slow just half a year later I can’t even use it anymore. Sure, it’s an entry level dual core laptop, but it clocks ridiculously high to 3.6 GHz and with single thread optimizations replacing multicore “Bulldozer” microarchitecture it was super responsive. It also has 4GB of RAM which is alright, but it also comes with a 256GB Samsung SSD. It’s not one of those crappy DRAM-less SSD’s, this is basically an OEM version of mid end Samsung Evo drives. Something between 750 Evo and 850 Evo. A well rounded package for not very demanding usage of music, videos, browsing and Youtube.

Except it became so slow opening Start menu takes 1-2 seconds and it opens in laggy way, opening simple JPG image takes up to 10 seconds, opening Opera browser takes like half a minute, playing 480p video on Youtube was lagging and 1080p30 was so slow it literally stalled the whole laptop and even moving mouse across the screen feels like it’s lagging and stuttering. All this at CPU usage of 0-5%. But feels like you’re having a 100% load on CPU by something.

I thought AMD drivers were the problem, but no matter what I tried, nothing changed. So I downgraded Windows 10 April Update (1803) back to Fall Creators Update (1709). And it was fine. Until it updated itself. So, after 5 total OS reinstalls, I managed to pinpoint the problem. This motherfucking KB4338825 update. As soon as it gets installed, laptop becomes the slowest thing in this world. I had to rollback from 1803 to 1709, but there is no way to selectively uninstall and disable fucking KB4338825 update, not even with the tool for this. And if I install April Update (1803), this garbage gets carried over automatically.

So, now I’m literally at a point where I can’t uncheck this update, uninstall this update and block this update from installing and fucking up my laptop. As soon as I’m on build 1709, this fucking update gets installed and fucks everything up.

If Windows Update worked like it did in Windows 7, I could reinstall OS, uncheck this update and I’d be using the laptop normally until I annoy Microsoft enough for them to finally fix this shit. But that’s just wishful thinking. God knows what else is screwing up my main rig because it often feels like it’s performing worse than i did months and years ago down to as simple things as moving mouse which just feels laggy. Sounds oddly familiar to this situation with my laptop, but since PC is so fast, it’s not as dramatic. But I can sense something is off.

So, here it is, if your PC or laptop feels like it’s entirely useless because it’s so slow (despite clean Windows 10 install), it’s because of this shitty update. I’ve left the report on Microsoft’s Feedback Hub, but I’m not expecting much because they won’t give a shit about a single user. Which just shows a sad state of PC industry. Linux is still garbage despite years of everyone saying it’ll overtake Windows and Microsoft just plain doesn’t seem to give a shit about the state of Windows or what its users want, because they know Linux is shit and we have to use their OS whether we like it or not. Which absolutely stinks as hell. And I run 3 systems, 1x Windows 10 Home and 2x Windows 10 Professional, all genuine licensed versions. Absolute fucking disgrace Microsoft.

What’s even worse, I used to have AMD E-450 APU, 8GB RAM and 128GB SSD laptop and it became exactly like this at one point. Which is why I bought this newer, much faster one. Which yet again turned garbage slow with exact same symptoms. Do you know how annoying it feels that I bought a new laptop because some other update fucked up performance of that one for no logical reason and I thought it just got slow somehow? Unless Microsoft is doing this intentionally to screw AMD and subtly force people to buy new laptops and migrate to Intel because everything AMD gets slow as turd “eventually” thanks to these magical updates. After seeing this on 2 laptops with like 4-6 years of age apart, something is going on. And it stinks.

15 thoughts on “Devastating performance hit from KB4338825 update on AMD A9-9420 APU

    1. I don’t know what it is and MS’s support was next to useless. I had to downgrade to Creators Fall Update and manually remove this dumb update. It’s now snappy again. What’s weird is that my old laptop with AMD E-450 had the exact same symptoms when I thought it was just “old”. It became ridiculously slow for no logical reason and I know it was capable of playing any web video with ease because of its relatively powerful GPU on top of weak CPU. But then, everything was to taxing for it, even 480p videos. Somehow. And everything was slow, just like this A9. If MS is doing this on purpose, I’m gonna be super pissed.


  1. Microsoft just released an update Patch Tuesday August 2018 (can’t remember the KB) where they mention a fix for family 15 and 16 AMD Processors affected by high CPU usage and degraded performance. I think i have seen a noticable improvement after installing this update. Have you experienced something similar?


  2. hi?same as here i have an HP laptop with a9 9420 CPU and 8gigs of ram (Ddr4) and is the same shit feels crappy and lag in youtube even in 1080p at 30 frames its stupid on my sister desk (that machine haves an Athlon x2 245 clock at 2.9) works better and i dont not why… If anyone knows someone please let me know.


  3. i have the same problem but i put windows 7 on it and goes like champ. the thing go to been laggin on on chrome to play 1080p 30fps really fine. And the cpu manage helps a lot on the little dual cpu. So its old os but works pretty well. (i think that works well too on windows 8.1 (i don’t try it again on windows 10 when i tried for the first 10 os revisions was laggy af)


  4. Hi Rejzor, i have an acer a315-21 which features an amd a9 9420 non-e, 8gb of ram and a crucial ssd bx500 128gb.
    For most of the times this laptop was a pain in the ass to use, originally it had an hard drive wd 1tb, so i tought it was the problem.
    With the ssd my load times dropped drastically, but the laptop still had some difficults in ordinary tasks.
    The problem indeed was this patch, in linux ubuntu with the 19.04 the performance are so much better than w10.
    So, what i did to fix performance on windows was to rollback to w10 1509 and also block the updates with this tool.

    Hope this will fix your problems too, the cpu itself has modest performance, but it’s not worst than a core 2 duo mobile like t5800, so for basic tasks it’s adequate.
    But still if you have to buy an entry level laptop look for something like athlon 300u or some old i3 like the 7020u, 2c/4 thread with modern ipc is definitly recommed.


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