Last reply by 08-26-2022 Unsolved
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Laggy 4k Video (XPS 15 9520)

Just got a 9520 with the i7 and I have an issue that has shown up a couple times here with older generations, but nothing in fixes it. Youtube 4K and locally stored 4K H.265 video lags significantly, with tons of dropped frames.  I noticed that task manager shows the "Video Decode" and "Video Processing" taking nearly 100% on the Iris Xe (my wife's Yoga 9 with a U-series i7 and Iris Xe shows only <10% usage). I can get it to go away sometimes on restarts or reinstalling graphics drivers.
I also noticed in HWinfo (separate app for looking at hardware stats) that when this occurs, the iGPU seems to get stuck at 99MHz. When it doesn't happen, the iGPU scales between 100MHz and 800MHz.
All the latest drivers here. Killer priorization disabled. Feels like a software issue, but one that has persisted over multiple generations (I see people all the way back to 9560 with this issue)?  Maybe I have a bad CPU that is randomly locking the GPU clocks at 100MHz?
Replies (20)
2 Bronze
2 Bronze

I can confirm I have the same issue with my i5 version.

I'm having issue while playing back video recorder with my phone ( Mi 11 ultra ). 
I've also tried every player: from windows stock, VLC and also installed K-lite codec pack with MPC.

Using VLC with HW decode OFF "solves" the problem


I have a thread going at Reddit with users that had issues with this and prior generations: (7) XPS 9520 With Laggy 4K Video : DellXPS (reddit.com).

I also did a ton of troubleshooting, including monitoring clocks and iGPU utilization stats using HWinfo.  I suspect you have the same problem (can follow the thread to see) since the i5 version I believe only has the iGPU, and deactivating HW acceleration means you are forcing the computer to use the CPU and since the issue lies with the iGPU, then that "fixes" the issue.

I also compared against a Lenovo Yoga 9 (with the i7-1185G7) and that one also shows much lower utilizations.

I tentatively have a solution - reinstalling the Dynamic Tuning Driver and the Innovation Platform Framework driver, working OK so far 16hrs straight so far.  Will update Reddit posting if I find it sticks beyond the 24 hr point.


I've updated the Dynamic Tuning Driver with no luck at all, will try to reinstall both of them and keep looking you reddit post.

Luckly this is my work's laptop and I don't look many video, but I would have returned the pc instantly if was mine, it's unacceptable for this tier 


I think this confirms that there is a problem with the iGPU (or a software problem involving the iGPU).  I can clearly see that, when the problem exists, the iGPU fails to boost and the Vid Decode and Vid Processing cores are running near 100% (see me thread here: (7) XPS 9520 With Laggy 4K Video : DellXPS (reddit.com).

I spoke to Dell support, they suggested a full system wipe and restore.  I did that, and the problem still comes back.  Reboots fix it for a few hours to a day or so, but it always comes back.  Next step is to get a hardware replacement, hopefully I get this replaced with a new unit given it is so new.

2 Bronze
2 Bronze

I have the i7 version and have the same issue. has anyone found any other fixes or should I be contacting dell support?

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2 Bronze

updating bio to new version from dell website from Jun 22 2022 has stopped the problem. I will post back here if the issues comes back. 


For me the problem still persisted after leaving the computer on for a day or so.  It seems the issue primarily happens after the computer stays on for a given period of time, so if you reboot daily or constantly move the laptop around, you may not see it.

I did a wipe and clean install, and still had the issue.  Installing Dell Power manager (not the My Dell app) appears to help so far, but in the end I opted for a replacement from Dell given the laptop was so new and since My Dell is supposed to be the replacement for Dell Power manager, so using the latter app is probably a temporary fix anyway).

2 Bronze
2 Bronze

Same problem, i9 with OLED. It laggs all system for me when i run video, sometimes even 1080p. I also think youtube is because of this default 360p? Tried quite a lot and no help... 

2 Bronze
2 Bronze

I have/had this same problem too. 9520 with i9. I've only had it for about three weeks now. The problem showed up randomly after my first two days of use. 4k video seemed to played at 0.5 speed although audio was at regular speed. Then I noticed that ALL video seemed to lag, even 480i. I tried LOTS of solutions, and what finally worked was to uninstall the display driver, and restart the computer. Problem solved... for a while. After a couple more weeks of usage, the problem reappeared. A simple uninstall of the driver and restart of the computer solved it again, but it seems like there's a bigger issue going on here.

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