Performance gets worse with more adjustments

LR 3.5, Win7, 64-bit (both OS & LR - and yes, I made sure it is the 64-bit LR running), 8GB ram
When I start doing adjustments to a photo it's really fast, no problems. But the more adjustments I add (mainly adjustment brush), the slower LR gets, the worse performance gets. It gets so bad that making a change to a slider can take 6+ seconds to see the change!
I'm making slider adjustments, using the adjustment brush a lot, and graduated filter adjustments. I have auto mask turned off, my raw cache is 10GB, the raw file is 16.7MB.
If I switch to a different photo everything is speedy again. Switching back and everything is slow. Closing & reopening LR has no affect, neither does rebooting. I haven't tried creating a new catalog and putting that one photo there but I doubt that would help. I do not have Photoshop or any other memory/cpu intensive programs running. I actually did try to quit everything and that didn't help.
I asked this on the NAPP forums and someone suggested:
- Is it a Raw file or Tiff or Jpeg?
Raw.
- Cache may be corrupt, try to purge the cache.
That did make a difference, but it's still quite slow.
- Delete your history?
I haven't tried this yet mainly because the I'm still making adjustments to the photo in question and I love being able to go back a bunch rather than having to start over again. I plan on doing a bunch of similar adjustments to another photo then deleting the history and seeing if that helps. Still, that's not something I want to be doing WHILE I'm still editing the photo.
- Open the task manager and watch the cpu/memory.
Did this and noticed when I made ANY change on a photo with lots of adjustments, both cpu and memory went up - cpu hit 85-95% doing anything and memory climbed from the 1.8GB it had when it started to 2.8GB. If I go to a new photo cpu stays around 40-50% and memory stays lower, around 2.2-2.4GB. And again, the more adjustments I added, the highter the cpu and memory went.
And it isn't just this photo. I've worked with many photos - both mine and from others - and as I add more and more adjustments (brush, sliders, etc), LR starts slowing down more and more. I also have LR installed on my work computer and my personal computer, both share the same performance issues. It's just when I get a LOT of adjustments made that this happens - mostly adjustment brushes.
Any thoughts? Thanks very much!!
From System Info in LR:
Lightroom version: 3.5 [775451]
Operating system: Windows 7 Ultimate Edition
Version: 6.1 [7600]
Application architecture: x64
System architecture: x64
Physical processor count: 2
Processor speed: 2.6 GHz
Built-in memory: 8179.8 MB
Real memory available to Lightroom: 8179.8 MB
Real memory used by Lightroom: 2732.6 MB (33.4%)
Virtual memory used by Lightroom: 2806.3 MB
Memory cache size: 848.9 MB
System DPI setting: 96 DPI
Desktop composition enabled: Yes
Displays: 1) 1680x1050, 2) 1680x1050
Application folder: C:\Program Files\Adobe\Adobe Photoshop Lightroom 3.5
Library Path: C:\Users\uchytil\Pictures\Lightroom\Lightroom 3 Catalog.lrcat
Settings Folder: C:\Users\uchytil\AppData\Roaming\Adobe\Lightroom

Pic4,
I would think that it's the same problem on Mac. As Lee Jay has explained "Simplistically, it has to redraw all the local adjustments every time you update a slider" these adjustments create o lot of traffic between your hard drive(s) and the memory. So - simplistic - if all the traffic has to go back and forth to the same hard drive, there's congestion. So better, divide the various LR "elements" between different physical hard drives.
Put your catalog on the external eSata - assuming that LR resides on your internal drive - and make your cache very large.
I'd like to put in a word about hard drives: Instead of choosing one (1) huge internal drive it would be better to have at least two, or better three internal drives that can be much smaller. I'd say three drives @ 250 GB give you much better performance than one drive with 1 TB.
With three drives, you'd put LR on drive 1 (C-drive), the LR catalog on drive 2, and the LR cache on drive 3. That way the system does not have to wait for one drive to finish writing before it can be read again (in simplistic terms) but the writing and reading happens simultaneously on three drives. That's the performance gain when you put the catalog, the cache and LR on different drives. It has to be different physical drives, partitions of one drive won't do it.
I would think that it's the same on a PC or on a Mac.
WW

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Volume                         : D:
VolumeId                       :
\\?\Volume{222fb
StoreId                        : {4D7E4D3E-EC7F-4
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