HTTP vs HTTPS response speed comparison

I published a webapp as standalone also on https (–port=80 --SecurePort=443). Doing the same request, the response seems to be lightly slow on https.

https -> 5 sec
http -> 4 sec

Is this correct or is it just coincidental?

I wouldnt be surprised if there is a slight difference between HTTP and HTTPS as the later requires more work to be done. In my testing, most of the time the speed is the same. Or slight difference like what you see.