I'm having what seems to be a known problem. I'm posting this in the hopes that maybe someone has found a solution to this as well as to expose the problem a little more to dell in the hopes that they'd address it.
I have a dell inspiron 7559 with the 4k display option. The laptop comes with an nvidia 960m as well as a 6700HQ. Windows animations lag. A lot of programs not built into windows 10 lag as well including chrome and firefox. Now the catch is that microsoft edge browser runs absolutely smooth. This gives me reason to believe that the problem may be a driver concern? For Edge to run smoothly means that the laptop has the power to render windows at 4k resolution. I guess certain programs may have problems interacting with the hardware.
If I lower the resolution in windows settings, the lag is reduced although still present depending on the amount of other programs I have running.
I updated my intel graphics drivers to the latest versions avaiailbe from dell and I've updated to the latest nvidia drivers directly from nvidia themselves. I tried updating to the latest intel drivers from their site but was stopped by an error message since the drivers are not made by dell.
Any help on the situation would be gladly provided. This is my only problem with the laptop as of now.
The 960m is perfectly capable at FHD resolution but it's not fast enough to run a 4K screen for many applications. The bare minimum for 4K is a GTX 970 -- and even it is challenged to keep up with a 4K screen under applications such as gaming.
In general, Edge is slimmed down resource-wise relative to Chrome and Firefox - it's a more bare-bones browser, which is probably why it performs acceptably,
Since Edge works, while other applications lag - it's not a driver problem. One test; disable the internal screen and attach an FHD external monitor and run the applications on that. You'll very likely find the performance is fine across the board -- and you'll then have found the issue.
I know the 960m isn't 4k gaming compatible. I wasn't refering to gaming performance issues. It should be noted that by default the intel hd 530 from the 6700HQ is responsible for rendering windows and the 960m is inactive. My concern is that, other branded 4k laptops which don't even have a dedicated nvidia gpu can run windows at 4k resolution just fine. While the dell with similar specs stutters.
Also, why would dell ship a 4k laptop if the laptop is unable to run windows at 4k resolution? That seems pointless. From my research, the intel hd graphics should be able to render windows properly, but something is causing it to fall short. That's why I assumed it may be a driver issue causing reduced performance from the integrated GPU.
Tried that method a few weeks ago after coming across a forum post about a similar problem on a dell xps 4k. Didn't work for me though. To add a little more information, nothing seems to be using up excess system resources. At idle my cpu usage is 1-2% and the gpu usage is low as well according to GPU-Z.
Do Dell representatives check these forums? I was hoping for a reply from them. It'd just be nice to know they noted the problem and are working on a solution.
The biggest problem for me is that it doesn't seem to be a hardware issue, so maybe dell just won't make any replacements or something like that.
Anyway, you just got used to the lags? How's that working out?