The only interaction with remote servers done on page load has to do with DNS. It would appear that your server's DNS service accidentally acts as a black hole, i.e. it never responds. The features which use DNS are (as they appear in the Configure WAF page):
Project HoneyPot integration. Set the "Enable HTTP:BL filtering" option to No to disable it.
Exceptions from Blocking, Whitelisted domains. Remove all of its contents to prevent a reverse DNS lookup on every request. I think that this is the most likely cause of the issue you are experiencing.
If this didn't help, another thing I'd check is whether you have a problem sending mail from your site. First of all, are you using a third party mail system, e.g. an integration with MailChimp, Amazon SES or something like that? If you do, try disabling it and see if that improves the situation. If it does you have a configuration problem there. If that's not the case go to System, Global Configuration, Server and click on the Send Test Email button at the bottom right of the page's content area. If that takes more than a second or two to reload the page and/or you don't receive an email then your problem lies with the email setup of your site. Please try to fix it by asking your host what are the correct settings.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
