Apache is listening on port 80.
I have a script doing a curl on a small static image and timing the response. It normally takes 0.04 secs but on 6 out of 10 requests it takes anywhere from 2 to 20 secs.
If I change the port to 81 all requests are fast.
Do you have any idea what can cause something like that?
Edit: Another weird thing is that "telnet 127.0.0.1 80" again often takes 3-20 secs. Port 81 answers at once.