While the issue with tons of PUT requests was resolved in this thread, now I'm seeing tons of GET requests (estimated at over half a million per month for a relatively low trafficked website. One suspect would be that the site all of a sudden got a lot of traffic. That's not the case. It seems like the high number of GET requests only started after I turned off force overwriting (thus solving the PUT requests issue).
Is this because with an auto-upload interval of 3600 the server will check S3 every hour to see if the file has changed (and will do so for every file)? Even so, I don't understand how that would result in over half a million requests on a standard WordPress site.