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Once the launcher wizard finishes, you launch the game. The internal Grand Theft Auto V Setup Wizard runs.
Most users click "OK" and never return. This is a mistake. The Grand Theft Auto V Setup Wizard allows for deep customization that can double your frame rate.
The wizard downloads .rpf archives (Rockstar Protected File). As they download, the wizard decrypts them in real-time. If your CPU is weak, this phase will be slow. The Setup Wizard relies heavily on processor single-core speed during this step.