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I feel that 11.10 boots very slow on my netbook. Many people said that changing concurrency method to shell in /etc/init.d/rc will speed up boot process, but the comment in the file said that the valid options of concurrency are 'none' and 'makefile', and the concurrency method since 2010-05-14 was makefile.

What are the differences between both? Is shell concurrency method still used until now?

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closed as too localized by fossfreedom Mar 12 '13 at 22:03

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i guess none will run all services sequentially, while makefile will run at the same time services with the same "precedence" – Salem Dec 7 '11 at 19:13
Possible duplicate of… – arrange Dec 7 '11 at 20:15