Speeding up the Appearance > Menus Screen in WordPress 3.6 / 3.7 / 3.8 / 3.9 / 4.0 / 4.1Do you have a lot of menu items, and have you experienced a dramatic slow down in your Appearance > Menus admin screen after updating to WordPress 3.6? Here I’ll describe why that happens, how to improve it, and provide a plugin solution.