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Originally Posted by redlabour
Uninstalled after using it for Month get nothing that i did not realize without using this. Still do not know what this does.
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As stated, default makes it not run as a background task. The user's page sits there and loads the "image" while the cron task is completed (the default cron script is called from within an <img> tag). This can take a little while, so the user keep seeing a "busy loading the page" icon or whatever until the cron is done and the "image" loads.
AJAX is Javascript, so the call to run the cron file is done truly in the background.