Luckily I stumbled upon a tutorial for the correct usage of precompiled headers: http://www.cygnus-software.com/papers/precompiledheaders.html
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Thanks to this, I was able to reduce the build time in the debug version from 1min:37sec to only 34sec. The Release build takes now only 24 seconds (I wonder why it is even faster tahn debug now).
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Changes comitted to SVN894