My Drupal 7 instance was getting slow. I realised that the problem was a cron job running. However, why is cron running when I'm browing the site? It shouldn't be, surely? It should only run when I run cron.php.
I don't have poormanscron running or anything else that I am aware of that could be kicking off cron. Any ideas of what could be causing this on Drupal 7?