[update 03:25 GMT] All systems have been back to normal since the previous update. We apologize for the earlier performance issues, and have identified a library used in our hosted environment that we are going to upgrade, which should help rate limit requests in future to prevent issues like this
[update 13:54 GMT] There's been an improvement in the server response time, and while it's still below expected performance, site navigation should be much improved. We haven't yet identified the root-cause of the problem but we're continuing to investigate, and will update this post with more information as it comes to hand.
[original post: 12:34 GMT] We are currently experiencing slower than usual page loads on some hosted sites. We are investigating the cause of these issues and will update this post as soon as we have more information.