Flutter timer.periodic is slower than real life - flutter

Question

I am using timer.periodic to call some functions at different times. The problem which I am facing is that the timer is much slower than real life like for example what you will see in my code that the timer should finish in 5 seconds but in real life its taking 25 seconds to finish.
void startTheTimer(){
var counter = 5;
final zeroDurationTimer = Timer.run(() {
_StartDataCollection();
});
Timer.periodic(const Duration(seconds: 5), (timer) {
print(timer.tick);
counter--;
if (counter == 2) {
_StopDataCollection();
}else if (counter == 1){
createUser();
}
if (counter == 0) {
print('Cancel timer');
timer.cancel();
print(numbers.length);
print(fifo.length);
}
});
}
the print on the compiler shows the timer ticks as 1-2-3-4-5 but its taking it too long to print 2 and then same goes for the rest of the ticks.
Anyone knows what is going on?

Answer 1

Timer.periodic(const Duration(seconds: 5), (timer) { //do function } mean, it spent 5s to do this function
So, if you do this function 5 times, it will spent 25s
Change to 1s will work:
Timer.periodic(const Duration(seconds: 1), (timer) {
print(timer.tick);
counter--;
if (counter == 2) {
_StopDataCollection();
}else if (counter == 1){
createUser();
}
if (counter == 0) {
print('Cancel timer');
timer.cancel();
print(numbers.length);
print(fifo.length);
}
});
or use for-loop instead timer
for(int i = 0; i < 5; i++){
await Future.delayed(Duration(seconds: 1));
counter--;
print(counter);
if (counter == 2) {
_StopDataCollection();
}else if (counter == 1){
createUser();
}
if (counter == 0) {
print('Cancel timer');
print(numbers.length);
print(fifo.length);
}
}