title: Xcode 4 became extremely slow and kills my hard drive
body: <p>My machine has 8 GB or RAM, Core 2 Duo 3,06 GHZ and it seems it is not enough for Xcode 4 (4.0.1).
  From some time now it started to behave more and more slow. Auto completion, editing code as well as Xib files became almost impossible to use. </p>
  
  <p>Other applications behave smoothly. </p>
  
  <p>Activity monitor shows a lot of RAM usage (still few GB left of completely free memory, so it is quite OK) and huge disk activity usage. I can see on the graph high peaks of data being saved periodically when I work in Xcode. After 3 hours of work there is 10.5 GB of data written to the disk. Is it normal?</p>
  
  <p>I have tried to disable auto-save but it did not help much.</p>
  
  <p>What can be the other causes of this extremely slow behavior of Xcode 4?</p>
  
  <p><strong>It did not behave like this from the beginning and it is not during Xcode indexing.</strong> To be even more interesting: when Xcode is indexing my project after cleaning it takes less CPU power than when indexing is done (CPU raises up after indexing again). Heh?</p>
  
  <p><strong>UPDATE:</strong> Complete reinstall of Snow Leopard (to the cleaned disk) together with Xcode did not help much. Xcode was working quite well just for a day or so and then slowed down again to the degree it is hardly possible to work with.</p>