Ubuntu slow startup

Sometime and/or everytime when ubuntu startup, it take a huge amount of time to boot n startup.
Why ?

Here some syslog show what is time eater:

Jun 6 11:09:43 nickfarrow-SMBIOS NetworkManager[1102]: <info> WiFi hardware radio set enabled
Jun 6 11:09:46 nickfarrow-SMBIOS dbus[819]: [system] Activating service name='org.freedesktop.Accounts' (using servicehelper)
/etc/mysql/debian-start[1885]: Upgrading MySQL tables if necessary.

Mysql take 11s to some task.
WiFi radio take 2 seconds
...
I note some task take more than 2 s.

My PC has not wifi so why radio
MySQL has some DB with about < 20MB in size.

n other.

May be need some tool to see log better : syslog ng or analyzer
http://terraltech.com/syslog-server-with-rsyslog-and-loganalyzer/
https://www.balabit.com/network-security/syslog-ng

Another annoying problem with ubuntu is often hang on. My PC and other in my com. ubuntu often crash. Mobo is MSI or ...
My laptop is ok, it rarely happened.

Dash slow response. [PC only]
=> Install compiz and Uni setting to disable allmost option like filter, search app online, history, log activity search ...
Change default super key to <Shift><Super> to avoid future hang on.

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