I'm having issues with my CPU getting too much load. The meters reveal that only the first core is pushing hard. I thought Windows 10 should be way better on dividing the load compared to Win7. My project has one instance of omnisphere which contains seven instruments. I hear "farts" and windows task manager reveals that the CPU is going to 100%. Rising the buffer size doesn't help. Never had problems with CPU power before. The CPU is I7-2600k.
 
Any ideas?
 
EDIT: Things that have changed in my system recently is the OS (Win7 -> 10) and Sonar Lexington -> Newburywhateveritscalled

Have you made sure that core parking is turned off?

Maybe roll back to Manchester and see what happens?

Turning off Core parking does come to mind. There are already a few threads on this here.  Also turning off all the obvious Windows 10 resource drains like Defender, Anti-Virus, live tiles, etc. 
Keep us posted ; )

Are you using Omnisphere in multi-mode?  I was never sure whether it was better to run it in multi, or just insert a new instance for each patch with a single stereo out - and I read somewhere that the latter approach can produce less demand on the processor (somewhat counter-intuitively).
 
My setup is similar(ish) to yours in the CPU department and I can normally have 5 or so instances of Omnisphere plus Kontakt, Arturia synths, audio tracks as well as numerous plugs without breakups.
 
<EDIT> I'm not on the latest SPLAT release btw (Manchester I think).  Also, I don't disable anti-virus or any other services because it is always connected, and when I get bored I need to quickly jump into Elite:Dangerous!

What is the CPU load without Sonar running?  After I updated to Windows 10 my first CPU core was 90%+ after after booting up the system.  I Sonar then has all sorts of performance issues, but the CPU drain in my case was not Sonar, but system interrupts which was hogging the first core.  I have sorted fixed the system interrupts issue  and the CPU is only at 1% or so before I start Sonar and now no more sonar performance issue.  
 
The only issue with Sonar is idiot (me) on the other side of the keyboard :-).  

gustabo
Have you made sure that core parking is turned off?

 
I never even knew such thing exists. I checked my power management setup and seems like the CPU maxing went away. :)
 

californiamusic
Turning off Core parking does come to mind. There are already a few threads on this here.  Also turning off all the obvious Windows 10 resource drains like Defender, Anti-Virus, live tiles, etc. 
Keep us posted ; )

I've always had my antivirus and firewall software on without conflicts. Is Windows 10 defender particularly bad? I used ZoneAlarm before but it doesn't work well in Win10.
 

Wood67
Are you using Omnisphere in multi-mode?  I was never sure whether it was better to run it in multi, or just insert a new instance for each patch with a single stereo out - and I read somewhere that the latter approach can produce less demand on the processor (somewhat counter-intuitively).
 
My setup is similar(ish) to yours in the CPU department and I can normally have 5 or so instances of Omnisphere plus Kontakt, Arturia synths, audio tracks as well as numerous plugs without breakups.
 
<EDIT> I'm not on the latest SPLAT release btw (Manchester I think).  Also, I don't disable anti-virus or any other services because it is always connected, and when I get bored I need to quickly jump into Elite:Dangerous!

I'm using multi. Wow. Didn't know it could be lighter to use separate instances. Definitely will try using Omnisphere that way since I find simple instrument tracks much easier to handle. BTW I'm using Kontakt and Arturia synths as well so we're indeed having quite similar setup. :)
 
Thanks guys so much for all the helpful replies!

Tried to do a little bit of mixing with the project and still getting a couple of farts once in a while. Obviously less anyway. At this point I'm not sure if this is something that could have happened with my old setup too. I haven't used Omnisphere this much in one project for a while.
 

ESharpe
What is the CPU load without Sonar running?  After I updated to Windows 10 my first CPU core was 90%+ after after booting up the system.  I Sonar then has all sorts of performance issues, but the CPU drain in my case was not Sonar, but system interrupts which was hogging the first core.  I have sorted fixed the system interrupts issue  and the CPU is only at 1% or so before I start Sonar and now no more sonar performance issue.  
 
The only issue with Sonar is idiot (me) on the other side of the keyboard :-).  

The CPU load is 1% while writing this. Around 15% when running the project after changing the power setup. So I think the CPU at least isn't a problem anymore.

What audio card are you using? Update your drivers for win 10.
There is also a way to divide the cores more evenly.
Go to preferences / Config / set thread count to 1 less then your core. set Enable set thread  idle  process to false.

I have my internet connection on my audio PC turned off unless I need it.  And have anything that's not needed in Windows turned off.. you never know what can cause a conflict or take unnecessary resources ; )