One of my websites has suddenly become extremely slow in server response - currently 41859 ms First Byte Time.
Already talked to hosting provider, but they did not notice any changes or problems with the server. So I am lost on what is the problem. Already tried plugins for caching and image optimization but I know that won't help.
Does anyone know what might be the problem? I've also run a security check but nothing was found, in case it's a virus.
Any ideas?