Some weeks ago, I have showed two small tips to tweak your Ubuntu Linux. The first one is to disable IPv6 and the second one is to reduce swapping. Today, I have another tip to make your gnome menus run faster.
1. Create a file named .gtkrc-2.0 in your home directory
echo "gtk-menu-popup-delay = 0"| tee -a .gtkrc-2.0
2. Logout and login again
I have tested with a value gtk-menu-popop-delay = 2000 before to try gtk-menu-popop-delay = 0 to see what is different in effect.