P: Slow performance on Xeon CPUs

Glad to hear it Scott!  Now to wait patiently I guess...

I spoke with basic tech support and grilled the guy with questions...he didn't seem to be aware of the issue. He escalated the call to the tech support manager. The manager immediately fluent with the problems I was having. He told me the Adobe engineers are aware of the multi-core problem as well as the high end graphics card issues and are working towards a solution.  If he was lying he was a damn good liar.

Well I hope the fix comes sooner rather than later and will agree that having to restart Lr after processing a few photos is killing me.  I have been using C1 just to get by and that software seems to take good advantage of the hardware I already have and is lightning fast with my setup.  

Once the fix is out, I would be curious as to what the underlying issue was. I am really hoping that Adobe wasn't blowing smoke Scott and they are working on a fix

Great news, its a shame that no one in Adobe even tought to do the simple thing and let us know its a known issue and they are working on it. Anyway don't build your hopes up for a complete fix in the next version. Probebly we are going to get another automatic f#@!*** recognition tool that streach your face on selfies before they fix it. This issue with performance on high end hardware was since the beginning. They did sort some issues with memory leaks but for the most of us it is faster after restart then when you work on few images it is slow again. So restarting seems to fix it. But we cant restart all day. Also image export is much faster after restart.

OK, spoke with Adobe support this afternoon and they acknowledge a problem with multi core processors (more than 4) and high end graphics cards with Lightroom. They said they have engineers working on the problem and unfortunately don't have a timeline for a fix. 

Similar problems here too.
My 2013 Macbook Pro pushing the same 3440x1440 display is twice as fast as my new build (Windows 10 x64, i7-6900K, GTX1080, Samsung 950 Pro and 850's, 64GB Ram).

Why is this???

For importing 1,500 images and building 1:1 previews it's twice as fast...I've timed it.
The develop module loads faster and is far more responsive as well.

Can someone please help?

I can confirm the problem with a E5-1650 v4

After the update to 6.7 the processor use goes to 100% when opening lr. Went back to 6.6.1 now it okay. Other problem with brushes and things like that I have too, thought that it a problem with my pc, but according to others its aldo an lr problem. My computer a Dell T5600 xeon 6 core with 24Gb memory.

LR CC 2015.6.1 was released 7/25.   So you might consider rolling back to 2015.6: https://helpx.adobe.com/lightroom/kb/roll-back-to-prior-update.html