Not noticed anything personally or had any other reports today. I'll go check with the hosts anyway, (just 13 hours late).
Another ticket has been created for the hosts. They told me yesterday that the server we're on is being overlaoded and they wanted to move our sites to a quieter server. This "could" explain the speed today so far. I'll update when I have news, but I've added or taken away nothing recently so not v-bulletin.
Server rebooted by my friendly American hosts! Took 3 tickets, 2 live chats and a phone call to convince them! Should be OK now. 1000 apologies.