Why Lightroom keeps using 30% CPU power all the time?

Hello all,
I am relatively new to LIghtRoom.
I started working on a new set of photos (400 app.). I opened it as new directory.
Since then, all the time I work on theses pictures Lightroom keeps using app. 30% of CPU time.
The over all time I spent on these photos is estimated to be more then 30 hours (yes, I am slow and open each in Photoshop while Lightroom is still opened). So I guess Lightroom finished all the rendering it wished to do.
My question is why and what it keeps calculating and is there a way to stop it?
System configuration:
Single core Intel Pentium 4 CPU, 3.6 GHz (Hyper Threading allowed)
2 GB RAM
NVidia 6600 based graphics card (256 MB)
Both LightRoom 2.3 and PhotoShop CS4 are opened
Please help - the system is slow anyway. It can realy use those extra CPU power.
Utzly

utzly wrote:
But I get a warning that changes I made to pictures in LR might not be
visible in other applications. Dose this mean that when I send the picture
to PhotoShop, or open the raw file later with bridge, all the editing inside
LR will not show?
The warning badge can be switched off from within View Options panel (Library module View menu) by unchecking the option labelled Unsaved Metadata.
With regard to your question as to whether Lr edits will show in Photoshop and Bridge/ACR - you'll be fine with Photoshop. However, for Lr edits to be visible in Bridge/ACR you will now have to manually save the metadata to each file (i.e. select file(s) then hit Cmd/Ctrl+S to save metadata to file).

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Why Lightroom keeps using 30% CPU power all the time?

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