I am using Ubuntu 12.04 from past 12 days. In the beginning login was fast enough after I put the password it hardly takes 3 to 4 sec to enter in desktop, but now its taking like more that 40 sec to show desktop after entering password. whats the problem, is there any solution?

P.S there is only two programs (psensor and jupiter) that starts automatically after login.

boot.log

fsck from util-linux 2.20.1
/dev/sda6: clean, 254544/3325952 files, 2133831/13285632 blocks
* Stopping Userspace bootsplash[164G[ OK ]
* Stopping Flush boot log to disk[164G[ OK ]
* Starting mDNS/DNS-SD daemon[164G[ OK ]
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
* Starting bluetooth daemon[164G[ OK ]
* Starting network connection manager[164G[ OK ]
* Starting AppArmor profiles       [170G 
[164G[ OK ]
* Stopping System V initialisation compatibility[164G[ OK ]
* Starting CUPS printing spooler/server[164G[ OK ]
* Starting System V runlevel compatibility[164G[ OK ]
* Starting Bumblebee supporting nVidia Optimus cards[164G[ OK ]
* Starting LightDM Display Manager[164G[ OK ]
* Starting save kernel messages[164G[ OK ]
* Starting anac(h)ronistic cron[164G[ OK ]
* Starting ACPI daemon[164G[ OK ]
* Starting regular background program processing daemon[164G[ OK ]
* Starting deferred execution scheduler[164G[ OK ]
speech-dispatcher disabled; edit /etc/default/speech-dispatcher
* Starting CPU interrupts balancing daemon[164G[ OK ]