This is the answer from our
FAQ:
If you downloaded a lot of files, like skins, objects, walls, floors, etc., then it's quite likely that The Sims takes a long time to load. This process can be speeded up in a few ways. First of all, you have to close all tasks running in the background, like Virusscanners etc. In Windows 95, 98 and Me you can do that by pressing Ctrl+Alt+Delete at the same time, and then select a task (any task except Explorer), and click the "End Task" button. Do NOT close the Explorer task!
Also, you can put all downloaded objects into FAR files. FAR Files load faster than all separate small files, and it saves some diskspace too. With The Add-on Handler, available in the Utilities files section here at The Sims Zone, you can use the "FAR Objects" feature. This will pack your custom objects in a single FAR file. Everything will still appear - but loading The Sims takes significantly shorter.
# Another way is to make files read-only: With Explorer, go to C:\Program Files\Maxis (or the folder 'above' the Sims' folder where you installed it)
# Select the folder of The Sims
# Now click File at the top (the menu) and click Properties
# Now if the read-only box is checked, uncheck it and re-check it. If it's not checked, simply put a check for it.
# Click the OK button, and apply the changes to all files and subdirectories.
Some other ways are pressing Alt+Tab right away when The Sims starts to load. It seems to be loading faster then, but why exactly is unknown. There's only one risk with this, and that's that you might lose your cursor in the game. If you run the game in Full-screen (which is the default) rather than in a window, it'll load faster.