Slow Performance with large library (PC)

I've been reading many posts about slow performance but didn't see anything addressing this issue:
I have some 40000 photos in my catalog and despite generating previews for a group of directories, LR still is very slow in scrolling through the pics in these directories.
When I take 2000 of these pics and import them into a new catalog - again generating previews, the scroll through the pics happens much much faster.
So is there some upper limit of recommended catalog size for acceptable performance?
Do I need to split my pics up by year? Seems counter productive, but the only way to see the pics at an acceptable speed.

I also have serious performance issues, and i don´t even have a large database catalog, only around 2.000 pictures, the db file itself is only 75 mb big. Done optimization - didn´t help. What i encountered is that the cpu usage of LR 1.1 goes up and STAYS up around 85% for 4-5 minutes after programm start - during that time, zooming in to an image can take 2-3 minutes! After 4-5 minutes, cpu usage drops to 0%, the background task (whatever LR does during that time!) has finished and i can work very smoothly. preview generation cannot be the problem, since it also happens when i´m working in a folder that already has all previews build, close LR, and start again instantly. LR loads and AGAIN i´ll have to wait 4-5 minutes untill cpu ussage has dropped so i can continue working with my images smoothly.
This is very annoying! I will stop using LR and go back to bridge/acr/ps, this is MUCH much faster. BUMMER!

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    I also have serious performance issues, and i don´t even have a large database catalog, only around 2.000 pictures, the db file itself is only 75 mb big. Done optimization - didn´t help. What i encountered is that the cpu usage of LR 1.1 goes up and STAYS up around 85% for 4-5 minutes after programm start - during that time, zooming in to an image can take 2-3 minutes! After 4-5 minutes, cpu usage drops to 0%, the background task (whatever LR does during that time!) has finished and i can work very smoothly. preview generation cannot be the problem, since it also happens when i´m working in a folder that already has all previews build, close LR, and start again instantly. LR loads and AGAIN i´ll have to wait 4-5 minutes untill cpu ussage has dropped so i can continue working with my images smoothly.
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       Picture Package Filter 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Pinch 13.0
       Pixar 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Plaster 13.0
       Plastic Wrap 13.0
       PNG 13.0
       Pointillize 13.0
       Polar Coordinates 13.0
       Portable Bit Map 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Poster Edges 13.0
       Radial Blur 13.0
       Radiance 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Range 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Read Watermark 4.0
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       Ripple 13.0
       Rough Pastels 13.0
       Save for Web 13.0
       ScriptingSupport 13.1.2
       Shear 13.0
       Skewness 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Smart Blur 13.0
       Smudge Stick 13.0
       Solarize 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Spatter 13.0
       Spherize 13.0
       Sponge 13.0
       Sprayed Strokes 13.0
       Stained Glass 13.0
       Stamp 13.0
       Standard Deviation 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       STL 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
       Sumi-e 13.0
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       Variations 13.1.2 (13.1.2 20130105.r.224 2013/01/05:23:00:00)
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    Great news!
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    OpenGL Version: 3.0
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    Video Card Number: 2
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    Driver Date:
    Video Card Driver: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.d ll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
    Video Mode: 1920 x 1080 x 4294967296 colors
    Video Card Caption: AMD Radeon HD 7800 Series
    Video Card Memory: 2048 MB
    Video Card Number: 1
    Video Card: Microsoft Basic Render Driver
    Driver Version: 12.100.17.0
    Driver Date: 20130226000000.000000-000
    Video Card Driver:
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    Video Card Caption: Microsoft Basic Render Driver
    Video Card Memory: 0 MB
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    Photos: approx 95,000
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