Maximum GPIO Pin Toggling in Bare-Metal DE1-Soc Project

Hello,

I am using DE1-SoC to start bare-metal programming for dual-core Cortex-A9 ARM hard processor, Cyclone V.

My code is just Toggling a GPIO pin to measure maximum toggling frequency for hps using Altera HWLIB as bellow

while (true) {

alt_replbits_word(GPIO_addr , 8388608, 8388608);

alt_replbits_word(GPIO_addr , 8388608, 0);

}

I get 500KHz as maximum GPIO pin toggling frequency.

My questions are:

1- Is this the maximum GPIO toggling frequency or I can increase it to reach more than 10MHz, if yes how can I ?

2- As I am working with 925MHz Processor It is supposed to get higher toggling frequency, is that true?

Regards,