I have a very high latency in the application (
sandengine.appspot.com), even some times I have an empty page and looking its source code I get:
<html><head>
<title>s~sandengine : uncaught application failure</title>
<body><pre><br></pre></body></html>
This is what the log say (For all requests and without filters):

This is the configuration of performance in the App Engine Dashboard:

This is the Instances and Billing status:

Thank you very much in advance for your help.
Rodrigo