Improve System Performance By Stopping Daemons/Services

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http://askubuntu.com – I am trying to improve my system performance by removing some daemon/Services. so i need to stop some daemons/services Which are Installed by Default in Ubuntu From auto starting . & manually start when ever i want to . Can any one provide list of daemons/services which are installed by default in Ubuntu & it will be ok with manual start just like i did with Ubuntu one these are few services which i have noticed & want to stop printer scanner ( saned ) bluetooth UPDATED what i meant by manually start ? To Disable bluetooth from auto starting after rebooting & (HowTos)