Cronjobs - Application hangs

I have an APP that pulls in some data via curl using the timer feature.
The timer id set to execute php code <?php include('cron.php'); ?> at an interval of 5000. It’s working but the APP hangs and becomes unresponsive, until the timer has finished.
Do have any suggestions to improve this ?

What does your cron.php job do?

The cron job run a script that checks urls for redirect using curl. Just one url is checked each time the cron is fired.

Check out: and read the note:

“If a program is started with this function, in order for it to continue running in the background, the output of the program must be redirected to a file or another output stream. Failing to do so will cause PHP to hang until the execution of the program ends.”

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Thanks for the help. I’ve managed to improve things a bit.