TM4C1294NCPDT: GPIO toggle speed only 2mhz

Hello,

Having some issues in regards to the speed at which we can toggle GPIO pins.

The code below is the test we have been running and looking at with a logic analyser - we see 2mhz which seems awfully slow. 

Is this accurate or are we making a obvious mistake? 

#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c1294ncpdt.h"
#include "driverlib/sysctl.h"

int main(void)
{
    volatile uint32_t ui32Loop;
    SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                SYSCTL_OSC_MAIN | SYSCTL_USE_PLL |
                SYSCTL_CFG_VCO_480), 120000000);

    SYSCTL_RCGCGPIO_R = SYSCTL_RCGCGPIO_R7;
    ui32Loop = SYSCTL_RCGCGPIO_R;

    GPIO_PORTH_AHB_DIR_R = 0x01;
    GPIO_PORTH_AHB_DEN_R = 0x01;
   
    while(1)
    {
      GPIO_PORTH_AHB_DATA_R = 1;
      GPIO_PORTH_AHB_DATA_R = 0;

    }
}