Very Slow compared to Lightroom 3

I love the updated, but it runs unbareably slow. Is anybody having the same problem? Working with the healing brush takes about two seconds each stroke.

This speed issue has some really weird aspects. I have been using two different machines with the same database. My workstation machine is a core i7, 12 Gb ram, quadro 1800 graphics, LR code on SSD system drive, images and LR databases on 1.5 T raid 0, 2 24" 1920X1200 screens. It runs LR3 like a hot knife through butter. The second is a Toshiba Portege R705-P35. This is a notebook with a Core i3 and 4 Gb of ram, no special video hardware. It runs LR3 competently, but not like the workstation. Both are running Win 7 64. Home premium on the notebook, ultimate on the workstation. Both are up to date.
I started with LR4 on the notebook with 350 images straight off the CF card (CR2s from Canon 50D). Everything seemed to be OK. I got home for the weekend and fired up the workstation. I saved all the metadata for about 5500 images to xmp using LR 3.6 then imported the files into LR4. That seemed to work. Keywords and develop settings seemed to be OK. Virtual copies and collections were of course gone as expected. Performance in the develop module was awful and only got worse. It took seconds to respond to sliders. At one point it seemed to crash every time I tried to change the crop on a virtual copy. (the crop change seemed to make it to the LR database but not to the screen. It was there when I restarted LR4!). I loaded the small database from the notebook into the workstation. It ran just as badly. I tried to replicate the crash scenario the next morning. No luck, so I can't give you a nice repeatable scenario. Turning graphics accelleration off in LR did not seem to make a difference.
I logged onto the forum. I am obviously not the only one having trouble with LR4 on a serious workstation. I powered off my second screen. That made a huge performance difference. The workstation was now only slightly slower than the notebook, but the sliders were still jerky. I did manage to use the new soft proof feature and make some prints. The behavior of the 2012 process looks very promising!
I copied the 5500 images and LR databases from the workstation onto an esata external drive. The notebook appears to be able to run it from the esata drive with no real problems. The 2012 process is sometimes a bit sluggish, but generally not bad. I have deliberately tried to stress it with local adjustments, sharpening, lens profile corrections, etc.
I have no explanations for this behavior and unfortunately will not be home to run more experiments with the workstation for at least a few days.

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