If you are using Linux Mint and have multi-core computer at home and wishes to speed up boot time by running processes in parallel, you can tweaked Grub to take advantage of parallelism.
Step 1: Edit /etc/init.d/rc and change CONCURRENCY from none to shell
# vim /etc/init.d/rc
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CONCURRENCY=shell
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You should notice a performance improvement in your boot-time.
