Need help figuring out what is killing my WordPress site

My website has been disabled on my host due to over use of the server resources. It's a cPanel type hosted site and it's using more resources than they allow. The problem is I'm having a heck of a time figuring out what is causing the problem. I've gone through the WordPress optimization guides, but it's still not enough.

This is what the hosting company came back to me with when trying to work with them to figure out what is going on and what I can do to help.

Considering the stats for the account, I wouldn't say that you are being accessed by a lot of visitors, however it appears that the number of times that your application is being hit causes a slow script to be executed on the account :

Code:

4222 (mywebsite)/index.php /home/aftercre/public_html/index.php 
1236 (mywebsite)/wp-admin/admin-ajax.php /home/aftercre/public_html/wp-admin/admin-ajax.php 
16 (mywebsite)/wp-cron.php /home/aftercre/public_html/wp-cron.php 
15 (mywebsite)/wp-login.php /home/aftercre/public_html/wp-login.php 
13 (mywebsite)/xmlrpc.php /home/aftercre/public_html/xmlrpc.php 
3 (mywebsite)/wp-admin/index.php /home/aftercre/public_html/wp-admin/index.php

Regrettably since the CPU seconds usage is not recorded on the executions of each script, we cannot be very specific on which script (whether a plugin or the theme) is causing the extensive usage of CPU seconds.

Click to expand...

Any ideas on what I can do? If I can't figure this out, then it's time to hire someone to look into this, but I'm broke and the site doesn't make money, so I'd like to try and avoid that if possible.

(Had to omit the website URL due to the limitations here. Like I said, it's down right now, but it's the same as my username if your curious.)