I’ve experienced also the delay on Css and Moo Menues at the Barite’s demo on FF, IE7 and Safari on Window Vista; but on my test site it performance is very erratic.
These menus have a delay when roll-hovering the drop down, specially with the 2nd level sub items and when the 1st level items are 3 and above. (my main menu items have up to 8 sub-items and some add a 3 item flyouts for the second level items).
I also noticed an erratic performance when changing the width of the menu item list on the css.
#ja-cssmenu li ul {
width: 16.4em;
width: 15.9em
Any suggestions on how to improve the menu performance would be greatly appreciated 🙂