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MSP432E401Y: For control system clock speed and GPIO fast mode

Part Number: MSP432E401Y
I am developing a product with msp432E401y. 
I'm controlling a lot of LEDs using the GPIO_Write() function, but the speed seems slow,
so I want to speed it up.
In the technical reference manual, there are registers related to systemclock. I would like to check what the current operating systemclock speed is. Is there a way to do this?
Also, I would like to increase the GPIO write speed. Is there a way?