Yea intense apps like games will run slower then a app like Facebook so get a SD card based on your use but I would suggest just getting a class 10 uh1 card and just install everything to it.....I had a class 10 and games like GTA vice city had no lag on the SD card
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Current Device: Samsung Galaxy SIII (SGH-I747)
ROM: Stock Touchwiz Rom
Kernel: Stock 3.0.31-2024954
Previous Devices: Motorola Droid 1, Pantech Crossover, Motorola Droid X, LG Revolution, Sony Ericsson Xperia Play (r800x)