LR 1.3 Grid View Pixelation

Guys,
I have recently upgraded to 1.3 from 1.2 on a new 2.8Ghz imac with 4GB running 10.5.1 using LR and I have noticed that the grid view in library mode shows pictures heavily pixelated for a few seconds when I scroll the grid view. After a few seconds the view is corrected as expected.
I do not recall this problem with 1.2 and I was wondering if something has changed in 1.3 or if I need to do some extra step to get back to the snappy LR grid view that I remember.
Also, has the 'discard previews after 30 days' option been dropped from LR now? I remember it in 1.0 but cannot find it anymore.
Any advice appreciated. Love the program!

Ian Lyons wrote:
I've uploaded a screen recording to http://www.computer-darkroom.com/screen_recording.mov
I'm rendering 1:1 previews at present, but even wit that going on in the background the scrolling isn't to bad when I put my Logictech Performance mouse scroll wheel in to free spin mode. The video shows free wheel scrolling when mouse is placed over grid, over the scrollbar and lastly slow scrolling. In the video I scroll through just over 20,000 images. The display is 30inch.
That looks somewhat better than I'm seeing, but still pretty terrible.  Lots of jumping, not much smooth scrolling.  LR 2.x performed much better than that on my old, slow hardware.

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