This applies to Nokia smartphones ( like Nokia 7610 , Nokia 6600 , Nokia N series and so on...). The options of any Theme has an option to ' preview ' the Theme. But this preview takes a long time ( about 4 seconds to load the preview and 5 seconds to go back in my Nokia 7610 with amble memmory left and no programs running.. ).
To preivew the theme much faster choose the ' Apply ' option and go to the desktop ( By using the shortcut key. That key is the ' End Call ' button ). This takes about 3.5 seconds but there is no need to go back. So the overall speed is more by about 66%.
b.