I ran these codes in custom invocation and got weird running times.

#include<bits/stdc++.h>
using namespace std;
int main(){
    //Hi
    for(int i=0;i<5000000;i++)cout<<i<<" ";
    return 0;
}

Run time: 2448 ms

#include<bits/stdc++.h>
using namespace std;
int main(){
    for(int i=0;i<5000000;i++)cout<<i<<" ";
    return 0;
}

Run time: 2901 ms

Can anyone explain why adding comment is having significant impact on running times?

PS: Changing comment affected run time slightly as well.