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Eclipse SDK horribly slow on Ubuntu

I found that compared to Eclipse on Windows my Eclipse Version on Ubuntu was running horribly slow. The easy solution to speed things up was to change the Java. My Ubuntu System came with openjdk set as default java. I changed it to the Sun ALternative und now Eclipse is running much much faster

update-alternatives --config java

  Auswahl      Pfad                                      Priorit├Ąt Status
  0            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      Auto-Modus
  1            /usr/bin/gij-4.3                           43        manueller Modus
  2            /usr/bin/gij-4.4                           1044      manueller Modus
* 3            /usr/lib/jvm/java-6-openjdk/jre/bin/java   1061      manueller Modus
  4            /usr/lib/jvm/java-6-sun/jre/bin/java       63        manueller Modus


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