WP-Cron running too much killing CPU of server

I have my site running under Hostgator and one of the first problem they find in my site was that I use allot of CPU.
So, in one of the attemps to make my site lighweight for the server, we put the
define('DISABLE_WP_CRON', true); in the wp-config file.
I wanted to try today to put this up again and doing a top -c in my terminal I notice that everytime my index file is access, the cron runs. Is this normal?
I use WP Super Cache too.