def optimized_capabilities(capabilities):
    """
    Returns the top capabilities with optimized performance.

    Parameters:
    capabilities (list): List of tuples containing capability names and their metrics.

    Returns:
    list: The top capabilities with optimized performance.
    """
    return sorted(capabilities, key=lambda x: x[1], reverse=True)[:3]

# Example usage
capabilities = [('evolved_verified_generate_test_1768680667', 4235.89001196408, 51, 8305.7),
                ('verified_default', 4235.0, 51, 8303.9),
                ('evolved_verified_fib_fast_1769055768', 4235.0, 51, 8303.9)]
print(optimized_capabilities(capabilities))