You might take a look at this thread and while it's not specific to your problem, respected colleague Kim O brings up an interesting point when she mentions: Networks are just not fast enough with all the packing and unpacking to send each request in a reasonable time.Could it be that you are bogging down on a network bottle neck when using ArcGIS Online? I don't have any experience using the geocoding services provided online so maybe someone who does can chime in here. (Perhaps a cross-post to the ArcGIS Online forum could help.)
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