ui.tabs - ajax tab switching mecanics seem wrong

When switching tabs using the ajax method of loading a separate page the tab doesn't switch until the full page loads. Most tab implementations switch to the new tab immediately, blanking out the contents. While I understand showing a blank page may seem useless, switching immediately makes the web app feel more responsive and since the behaviour is triggered by a user interaction, it should be assumed that they no longer care about the contents of the page they were on. This will also allow for a more prominent spinner to be displayed in the content area.