From BluePrint we can read that there is a way to shorten the loading times of Vacation. This is easily done by putting everything except walls, floors and skins into FAR files. A FAR-file within another FAR-file won't be read too. Other things like turning off virusscanners, setting the compatibility mode in Windows XP etc. might also save some time. More detailed information can be found at BluePrint. Part of this information also comes from Tom van Dijk from IFF Edit.