I'm sorry you're having trouble with your website. While checking into this for you, I was unable to recreate the issue you are seeing, the main domain and the subdomains all load quickly for me. This type of behavior usually indicates something within the site's coding that could be optimized to reduce page load time and improve performance on the site. I'm not familiar with the program you are using, but I do see that it is PHP based software developed by a third party.
There are quite a few errors in your error_log in your public_html file. If you are comfortable editing your program's files, you can use these errors to help you identify coding errors. If you are not comfortable editing your files, the best plan of action would be to contact the software developer.
If you have any additional questions or need further assistance.
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