Lightroom 5.6 on Win 7 Pro 64 bit SP1 tying up CPUs, running very slowly

Question

Hi,
I have Lightroom 5.6. Whenever I use the Spot removal, Graduated filter, Radial filter or Adjustment brush tools in the develop module, it ties up the 6 CPU cores (as viewed in Task Manager) so everything goes very slowly. For example, the effect of a stroke with the Adjustment brush only appears on screen after 5 seconds or more.  Sometimes it gets so bad that I have to kill the process and restart Lightroom.  It affects other programs running at the same time, as they can't get enough CPU.  It is basically unusable. An edit that should take five minutes can take an hour.
The problem happens when I either
In the Library module I select an image that I have previously used the tools mentioned above on
or
In the Develop module when I use those tools.
It is not just an issue with Lr 5.6 - previous versions also did this on my system.
My workflow is:
Browse the library module, adding images to a collection (Canon EOS 7D raw)
For each image in the collection I:
Select the image
Create a virtual copy
Stack the original and copy together
Edit the copy
Export AdobeRGB 16 bit PSD to Photoshop for sharpening and conversion to CMYK
Place the image into my InDesign document
I occasionally use Perfect Photo Suite 8.x on my images from within Lightroom.
I have been a software developer for over 30 years, so I'm not doing anything stupid. Lightroom is just spinning the CPU cores to no effect, like it has a thread or threads in an infinite loop.
I typically have Lightroom, Photoshop (CC or CS6) and InDesign CS6 running at the same time.  All three together occupy just over half of the available RAM.
I have a prettty fast machine (see the specs below) and other software does not tie it up like this (except rendering video in Pr or Ae, which I expect).
I have tried googling for an answer, with no success.
I feel this is an issue that Adobe ought to provide technical assistance for, given the technical nature and severity of the problem.
Please help.
Machine details:
Windows 7 Professional 64 bit, Service pack 1, all updates applied
Processor AMD Phenom(tm) II X6 1055T Processor
Memory (RAM) 16.0 GB
Graphics NVIDIA GeForce GTX 780 3GB
Primary hard disk 71GB Free (209GB Total)
Disk Storage Total: 5.9 TB

Answer 1

Thank you curve8530curve8330 for stepping up and helping me out ...
I think I'll try re-installing the BB Desktop Software 7.1.0.41 ... the ' ... no  BB Device Software installed ... ' GUI message has me concerned that there has been a Registry disconnect somehow involving the USB driver software registered with BB D. S. 7 ... this would indeed be a Windows 7 problem ... I'll update the thread and give you credit for pointing me in this direction ... if it works.
However, to be clear, I am connecting my 9630 using a USB interface cable connected to a USB 2.0 port on the Win 7 system ... I am not removing the 8GB MicroSDHC card from the phone and then utilizing a MicroSD to SD adapter or SD port ... whatsoever.
And , as for connecting via another computer, now that I have thought about this some more, that may have been what precipitated the problem in the first place ... I had experimentally tried re-connecting the 9630 to an XP Pro SP3 32-bit notebook loaded with BB D. M. 5.0.1.28 ... (after never having done so again since the Win 7 Pro SP1 64-bit / BB D. S. 7.1.0.41 system came into use).  I don't see, off-hand, how that could have caused this issue, however, the coincidence is too large to ignore.
FFF