What dream did you play? Are your video drivers refreshed for Win10? (I found myself having to reinstall my AMD drivers on my Win10 update) Is the 960 pushing video out, or is the 980 exclusively used for output?

It does not matter what dream or codec the dream is in, framerate is too low on win 10. Great, smooth video when I boot to win 7 or 8. 

I have tried every driver for 10, no difference.

The 980 connects to a Denon x4200 Atmos AVR. Which connects to the 4K TV. I used to have the 980 connected directly to the TV before I got the 4K AVR.

The 960 drives the 2 27inch 1920x1080 monitors. I used to have a GT-750ti driving those. I was hoping that changing the 750 for the 960 would help, no difference at all. 

So it is either the drivers, win10, or the app. I don't blame anything. I stay open minded. 

Well it seems to be a good framerate if I apply wallpapers to monitors 2 and 3. And the dream to mon 1 the 4K.

But if I set a dream on either 2 or 3 while 1 has a dream, it gets choppy.

This does not occur on win 7 or 8. Framerate stays the same with 3 different dreams playing or 1 dream playing.

What dream? Have you refreshed your video drivers as I described above?

I put the dream Color Pop by Azdude on mon 1(4K). 

Monitors 2 and 3 have wallpaper applied by Deskcapes. Color pop works fine, no lag or system slowdown.

Then I apply the dream Constellation by Patrick Mathews on Mon 2. 3 still has wallpaper. Then the Deskscapes gets choppy. In fact, windows gets slow. Mouse is laggy. Dragging windows is slow. Overall slowness. That does not happen at all when I boot to earlier windows versions even with 3 dreams going.

It really doesn't matter what 2 dreams I use. Using 2 causes a big system slowdown only on windows 10. 64bit

The overall CPU load with 2 dreams applied on my AMD 8 core is fairly low. Between 27-33%

Yes, done many driver refreshes. I am now using GeForce Hotfix driver 358.59. Released 2 weeks ago. 

Have you enabled the setting in DeskScapes to support multiple gpus?

Yes, I always have that set.

I cannot seem to find this dream anywhere.  Is it a purely video dream or a dynamic dream?

I am having problems with multimonitor use under windows 10.  In my case, the selection of anything except the far leftmost monitor as primary causes Dynamic dreams (e.g. PhotoDream) to fail and/or render Deskscapes problematic to startup, etc.

For now, I've just been running 3 video dreams on 3 30" monitors to get around the bug(s).

Note that my first test with ColorPop shows that it more than doubled the CPU use of DShost compared to videos like Dream Machine, Utopia Prime, and Goodnight Earth, which are all MPEG2 or MPEG4 codec videos.  I can't tell from the Color Pop link what codec it is encoded in, but I suspect that I'm not getting hardware/GPU accelerated decoding with Color Pop.  

Do you have the same problem if you use one of these other dreams on your system?

Two of them cost money to own (well worth it IMHO), but Dream Machine is a free one https://www.wincustomize.com/explore/dream/1809/

I hope this helps.

Just a video dream. I couldn't find it either. I probably got it many years ago. I never install dreams. I put them in a custom folder on a different partition. And just add custom folder in Deskcapes.

I uploaded it here

https://www.mediafire.com/?22kyny2bja40g0z

I just updated my original post with more useful (I hope) information.  I'll test your upload as well, thanks.

Update: Constellation plays fine at my end.  No problems with high CPU, etc.  I assume that it's MPEG 2 or 4 encoded and my system has no problem GPU-wise with that at all.

I just happened to use color pop and constellation as an example because SD asked. 

I tried color pop alone. It was smooth at 4K. Put constellation on mon 2 and bam, slow. I couldn't tell that constellation was choppy. It is a very slow moving dream and seems lite. But color pop the slowness really showed. Even my system slowed. 

It doesn't matter what dreams I use. There is a lot of slowdown on win 10 with multi monitors. 

I did limited testing on one of my other PC's that has 4 1080 monitors. GTX-750Ti and a GT-640 4GB. It's a multiboot too. I'll finish testing tomorrow. Didn't have enough time today. 

Since you and I are both able to run whatever configuration we want, with no lag, etc. on Windows 7, it definitely seems as though it's going to be a problem with Deskscapes and Windows 10 talking to each other.  I'm seeing little or no evidence that the latest version of Deskscapes is using any GPU acceleration for video on Windows 10, just CPU.  But that's just by monitoring CPU vs. GPU clock speeds between running and paused.  That might not give an accurate picture.

But if it is trying to brute force 4k video with just CPU and no meaningful GPU assist, that's going to give the system quite a headache.  

We'll just have to see if Neil and the gang can narrow this down better than we can.