Speed issues with Precise on AMDAthlon

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http://askubuntu.com – I have an AMD Athlon X2 260 processor (dual core @ 3.2 Ghz - No over clocking, default BIOS values) running on an ASUS motherboard. It is a brand new motherboard and has 4 GB RAM. I have installed 12.04 -64 bit on it. All updates installed Firstly, it takes about 13 secs to log in and see the desktop wallpaper after entering the password. Beyond that, it takes 3 seconds more to see the Unity Bar and the icons. Whenever I am opening any application for the first time, it takes anywhere between 10 to 30 seconds. For e.g. Firefox browser (25 secs) , Gwibber (15 secs), Empathy (12 secs), Evolut (HowTos)