Extremely slow boot on MacBook Air

Question

Hello!
Up to one week ago my MacBook Air was booting in 10 seconds.
Suddenly it takes over 3 minutes to startup. I did not have installed any particular application or service in the last weeks
I checked the logs and the only strange lines are:
May  7 21:23:11 localhost bootlog[0]: BOOT_TIME 1399490591 0
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.appstore" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.authd" sharing output destination "/var/log/system.log" with ASL Module "com.apple.asl".
          Output parameters from ASL Module "com.apple.asl" override any specified in ASL Module "com.apple.authd".
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.authd" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.bookstore" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.eventmonitor" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.install" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.iokit.power" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.mail" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.MessageTracer" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.performance" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.securityd" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May  7 21:26:39 --- last message repeated 6 times ---
May  7 21:26:38 localhost kernel[0]: Longterm timer threshold: 1000 ms
Please note the 3 minutes delay betweek line 1 and line 2.
I tried to resolve the issue by resetting PRAM and reparing the disk (no repair required).
Thanks in advance.

Answer 1

Do you have bootcamp or a VM installed?
Remove all external devices then test. Do you still see the same slow boot?
This solution was posted here:
Clear the kext caches:
sudo chown root:admin (enter password)
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Do in terminal and reboot. make sure your start up disk is still selected correctly in preferences.
If you search on "ASL Module "com.apple.appstore" claims selected messages." you'll find lots of results and none had the magic bullet fix.
If performance after login is not affected, you might have to live with this until there is a fix.
You need to report it to Apple Feedback so it can be logged and put in the queue to be fixed.
http://www.apple.com/feedback/macosx.html