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Thank you ,
I had something simular on one of my websites. It will almost certainly be a plugin or your theme. I would disable any plugins that aren't used on the front end and see if thatakes a difference.
Also I would look to upgrade to the latest version of c5.
If you would like help I can help you.
Make sure you are using caching, this can help your site be more efficient.
Blocking robots from crawling your site, can often help as well, here is their guide on how to do that:
If your problems persist, feel free to message me. I can take a look since I work for their sister company.
I hope this helps,