Perfomance/memory usage issues running LR 3.3 on 32 bit Win XP

I'm using LR 3.x for some time now, at the moment my version is LR 3.3. My machine is set up with a 3.6 GHz core 2 duo cpu, 4 GB of RAM and four samsung spinpoint hdd. LR 3.3 runs on Windows XP SP3 32 bit OS, usable memory is 3,25 GB. At HDD 2 LR is installed, at HDD 3 library is located, at HDD 4 LR cache (20 GB) is located. I use one "big" library with around 20.000 raw images. I use 1:1 preview and deactivated deleting preview.
I noticed that LR is working slow after some time of working on raw images. Tools are lagging, rendering takes very long and sometimes I get the error message that not enough virtual memory is available anymore. Also in task manager I noticed a continuos increase of memory usage, starting around 800 MB, ending up - I can't work anymore - around 3,00 GB. Memory usage never lowers.
Do you have any information how to solve this perfomance/memory issues? Thanks and best regards from Germany.

There is a large thread for this.
Here is the link: http://forums.adobe.com/thread/760245?tstart=0
WW

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    Thank you for your answer (even if it did appear to me to be a bit rude/shouty, perhaps something more polite than "Wrong!" next time) but I'm sitting at my computer, and I can see what is using how much memory and when, you can't.

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