The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
A workflow runs faster when you do not configure it to write session and workflow log files. Workflows and sessions always create binary logs. When you configure a session or workflow to write a log file, the Integration Service writes logging events twice. You can access the binary logs session and workflow logs in the Administrator tool.