bumblebee working slow on ubuntu 11.10

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http://askubuntu.com – I am using ubuntu 11.10 I recently installed bumblebee on my optimus laptop but it's performance is worse than the intel graphics card only giving 5 to 6 fps and giving an error : failed to create drawable. my laptop has nvidia 420m graphics card. how can i use my intel graphics card correctly using bumblebee ? (HowTos)