As of 19:00 UTC site speeds have returned to normal. We are still investigating the root of the cause but regular performance has been restored.
We noticed an unusual amount of queries on one of our servers during the time of the performance impact. In an effort to resolve this, we’ve made some optimizations regarding these queries and pushed them out to the server affected. We’re continuing to keep an eye on this, though we believe this optimization will promote resilience in this situation.
We are currently experiencing slower than usual page loads on some hosted sites. We are investigating the cause of these issues and will update the this post as soon as we have more information.