Install required modules

sudo apt-get install python-gevent

sudo apt-get install python-setuptools

sudo easy_install psycogreen

sudo easy_install greenlet

Enable multi-core usage

Edit odoo.conf

Edit or add

workers = n where "n" is the number of cores in your CPU.

After enabling multi-core CPU configuration, you need to configure odoo.conf

[options]
proxy_mode = False

You also need to enable and configure the nginx reverse proxy, otherwise style issues may occur.