UITabBarController slow switching

[WauloK]

Hey guys!

I'm writing an app which has a UITabBarController.
Two of the tabs load up UIWebViews.
If I tap on a tab with a UIWebView it can take 5 or so seconds before the tab activates, let alone start displaying something.
Do I need some LOADING... screen to swap in first as it loads faster then work out when another screen with the website has loaded and switch back?
I get the ability to put an ActivityIndicator and things on there, but they won't show if the tab doesn't activate for a while.

TIA