Qml Demos utilizing the network appear to be very slow (Windows 7/64 bit)

All declarative demos using the network (e.g. flickr, photoviewer, rssnews, webbrowser) show very bad network performance on my local Windows 7 machine. E.g. the flickr demo requires 20 seconds to show the first images. Under Linux, in the same network, they appear almost instantly. Specifically, the 'demos\declarative\webbrowser' demo requires >40 seconds to load the nokia homepage, while the 'demos\browser' demo shows the same page in about 1 second.