Change speed of for loop

Hi,

I am currently writing a script that analyses a .txt file pseudo-real time. I am using a for loop to do this in order to do as if the data comes in real time (one sample at a time). However, Matlab uses its highest speed to perform this for loop. I am wondering whether it is possible to change the speed of a for loop. In that case I can let the samples enter the for loop at the same speed as they were originally recorded.

Thanks!