I have a test game which is empty of CC and only has 1 empty neighborhood, so it loads fast(to make one, rename your EA Games file-I just temporarily add "play", so it's EA Games PLAY- then restart the game; a new EA Games file will be generated with no custom content, go into the game and enable custom content, make an empty neighborhood, delete all pre-generated neighborhoods, and exit). Make a Downloads file for your new game and load up what you want to look at. Start the game. Make a lot in your neighborhood and place all your new CC on it. Delete what you don't like. Exit the game. Transfer the stuff you kept to your play game (I still use a folder in the play game for it called test until I've tested it in my play game to make sure it doesn't have problems with something I've already been using). Rename the EA Games files, so the play game is EA Games and the test game is EA Games Test, and your real game will load with your new content.