UITableView with Custom Cell Height

I'm writing an application, where startup view contains UITableView - which seemed pretty slow. Basic version is not too bad, but when using a custom UITableViewCell created from XIB, it became totally unusable.

Time to debug whether Interface Builder's XIB makes things slow!

Can't Start Debugger. CFSocketSetAddress Returns Error -1

Was debugging an application in real device, when suddenly got an error note about failed network connection. Since this happened before application launch, I got curious.

Why would debugging application in device fail due network error before launch? Why would it fail now, when everything was ok dozens of times just beforehands (yes, I do a lot of quick but short debugging sessions in real device)?