[felix]

+1

• For subforums, have it either instant rather then animated, as in
  

  $("#subforumslist").toggle("slow");

  or if animated something more fancy:
  

  $("#subforumslist").slideToggle(350);

  (these don't require the UI libraries)
  
  If you're comfortable with changing code, the best solution animation wise would be for open to be instant and close have the slide animation. This avoids any jerkiness and is overall pleasing as well as fast to navigate.