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I have two BIG problems with my laptop, that one of them I want to ask here and it is about boot time latency. my laptop boots really slowly. Witch app is necessary to remain and witch one can be removed from startup using BUM?

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closed as off topic by vasa1, hexafraction, Rafał Cieślak, fossfreedom Feb 24 '13 at 19:32

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Strictly speaking, this is off topic and should be asked somewhere like here – Chris Carter Feb 24 '13 at 11:13
That argument has been used before. The fact remains that some modifications are made. – user25656 Feb 24 '13 at 11:52
The only thing where you can -see- a faster boot: change the disc to an SSD – Rinzwind Feb 24 '13 at 14:10
OK! I Edited my question – Mostafa Shahverdy Feb 25 '13 at 4:34

A lot of the startup apps are now hidden.

Open a terminal and type:

sudo sed -i "s/NoDisplay=true/NoDisplay=false/g" /etc/xdg/autostart/*.desktop

Open startup applications:

NOTE: Don't uncheck/disable what you don't know.

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Are you sure? I think will make them be not hidden just from startup applications menu, am I right? – Mostafa Shahverdy Feb 24 '13 at 10:59
Yes. All apps are now listed. – Alex Seicean Feb 24 '13 at 11:01
But ok, witch ones should I remove? – Mostafa Shahverdy Feb 24 '13 at 11:03
That depends on Your specific needs. I personally found out that disableing the startup apps didn't speed up my boot time. – Alex Seicean Feb 24 '13 at 11:05

Seeing the bootchart questions:

  • kthread and similar stuff is not KDE but kernel related and unavoidable.
  • ureadahead is supposed to speed up application start on the cost of a longer boot time.
  • upstart-udev-br bridges udev events into upstart and is required for hot plugging.
  • upstart-socket, dbus and polkit are desktop comfort and security related.
  • modem-manager to dhclient depend on network speed.

General recommendations:

  • Don't mount NTFS volumes during startup; add noauto to partitions that you use rarely.
  • If you don't use WLAN or bluetooth, activate the killswitch or disable it by network-manager.
  • Remove unused printer drivers; If you rarely ever print, disable the cups service.
  • Gnome / Unity can be somewhat hefty on older laptops. Explore alternative desktops like xfce or lxde.
  • Consider buying an SSD. That really speeds things up.
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