Need to disable W3 Total Cache output buffering

[bobbingwide]

When running oik-batch in an environment where W3 Total Cache is activated the output written using echo is not displayed until the whole routine ends. This makes it very difficult to see any prompts.

Explanation

W3 Total Cache adds its own output buffering.
W3TC\Generic_Plugin::ob_callback

Workaround

Deactivate W3 Total Cache