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High Latency and DPC issues storport.sys


Jan 27, 2019
It's not clear to me what you might be referring to as far as video lag. Not responding to mouse input as quickly as you're used to or ?

As far as LatencyMon, I wouldn't be too worried if you're no longer getting the audio pops and dropouts. I recently installed a Windows 10 Insider build and ran a trace of my system. It was showing quite high DPC processing times for DPCs running on cores other than 0 and sure enough it was associated with ntoskrnl.exe. One took as long as 17 milliseconds which would normally be considered terrible and yet my system was running better than it has since the Spectre/Meltdown updates last year. So I think Microsoft have done some tweaks regarding ISR/DPC scheduling to make better use of multiple processors in the Insider builds and I doubt LatencyMon is taking those changes into account yet - if ever they do. When I reverted back to build 1809 all my DPCs went back to sub-millisecond levels so if you're still using an Insider build it might be worth trying the 1809 build to see if your DPCs also become more reasonable.
Hi - the video lag/dropped FPS almost, even when opening the start menu etc seems to have disappeared. A new nvidia driver came out and I installed that, and I'm not sure if that's whats fixed it. I haven't been checking Latency Monitor, and I'm on the latest Windows Insider build at the moment - There's been no stuttering/audio pops etc. It seems my Sandisk SSD was faulty, although a part of me wonders if for some reason my old SSD was just incompatible with my PC's hardware - the issues seem to come round right about the time I built my new PC, and the SSD was only 15 months old at the time. I now have a Corsair MX500, which is supposedly one of the best SATA SSDs you can get.

One last unrelated question - there's currently a great deal on a G-Skill 3200mhz 16GB DDR4 RAM module - would you expect this to significantly improve performance over my current 8GB 2667mhz module? I do not do any video editing etc, just a light gamer (although when I do game, its usually the high end graphically intensive games), 4K movie watcher etc.

Lastly, thank you so much for your assistance. Truly, you have no idea how good it is to not have those DPC latency issues anymore. I no longer have to restart my PC 15+ times a day! :)


Sysnative Staff, BSOD Kernel Dump Expert
Apr 3, 2017
If your system has a bottleneck I would suspect it to be the GTX 1060 but it's hard to say without knowing what kind of gaming you're trying to do. 1920x1080 at 60Hz or ?

I'm probably not the best person for advice on such matters, though, as I focus on stability rather than performance and haven't put any effort into overclocking. DDR4-3200 would be a significant overclock for your CPU's integrated memory controller so you'd want to get advice from someone who knows what they are doing. Unfortunately, there's no guarantee anyone could get it stable and it could just end up being a waste of time and/or money. I've seen quite a few Ryzen CPUs not able to handle DDR4-3200 settings.