Hi. Your questions are much too general to be answered.
Please specify a problem. Include your OS and Aperture version numbers. Tell us what you have done, so far, to try to resolve the problem, and what the results have been.
If you do not communicate in English well, have someone who does translate your post. If no-one is available, you can try Google Translate (or equivalent).
As a start, you might try on a 4 GB machine running Aperture with no other applications open. Also, open the Activity window (in Aperture) and see if anything is reported there.
I have a mac book per, 2.8 Ghz Intel Core i7 with 4GB!
it can not be true that I can not even edit one photo.
as soon as I open a RAW image and make a small change. it takes the whole capacity of 4GB and the mac book can not do anything.
it is only open aperture. I work 2 minutes and then everything falls apart.
To add to Kirby's questions - for there may so many different causes for slowness, and we need more clues to be able to help you.
How full is your hard drive? Do you at the very least have 10 GB of free disk space?
Where is your Aperture library loacated? On an internal disk or an external drive?
What did you do, three month ago, when the problem started? Upgrade Aperture? Installed other software? Import new projects?
Have you imported an iPhoto Library?
What is your current Aperture version? Have you upgraded to the latest Aperture 3.4.3?
Did Aperture crash recenty? If you experienced crashes, start by repairing your Aperture Library, see:
When I upgraded to Lion I doubled the RAM to 8GB, and Aperture was running faster, but your screenshot shows that you still have plenty of free RAM, even if there are many page ins and page outs (Seiteneinlagerungen/Seitenauslagerungen).
I suspect a corruption of your Aperture Library. Does Aperture work well, when you create a new library (Ablage > Zur Mediathek wechseln > Andere/Neu) and import a few raws?
If Aperture is working well from a new library, try to repair your current Aperture library.
Eine deutsche Fassung dieses Hilfetextes finden Sie im Hilfe-Zentrum
Hilfe-Menu > Aperture-Hilfe
und dann im Suchfeld eingeben: "Wiederherstellen und Neuerstellen Ihrer Aperture-Mediathek"