At about 7:30am US/Pacific time this morning, Google began experiencing slow performance and dropped connections from one of the components of App Engine. Many App Engine applications are experiencing slow responses and an inability to connect to services. We currently show that a majority of App Engine users and services are affected. We are actively working on restoring service as quickly as possible.
We are posting regular updates to our downtime-notify list here: https://groups.google.com/forum/?fromgroups=#!topic/google-a...
Thanks, Christina, Google App Engine Product Manager