Related to the question here, is the Android Library Update step necessary and, if not, can it be removed from the startup and/or build process? A manual update seems like an appropriate option, especially if it improves build times and you already have a previous clean compile.
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this may not exactly answer your question, but if you do have a lot of projects it will rebuilt all of it when you open eclipse. what i do myself is i “close” the projects that I’m not working on and I find it more tolerable