According to my records, you have not downloaded v5.3.0b1 with either of your two licenses, which probably goes some ways towards explaining this discrepancy :)
Remember; Beta versions need to be chosen explicitly the same way you do when downloading XenForo itself:
It is not possible to add a setting as the cron job runtime cannot be controlled that way. You should change the time zone - I’m not sure if it runs on the actual server time zone or the XF guest time zone.
It's interesting to read from this thread that I'm not the only one who's been "attacked" by these bots 🤔 On my site they were able to trigger out of memory errors (that I annoyingly couldn't replicate when replicating their requests), and in the server error log I'm finding some very...
An easy way to test this for yourself once you have made configuration changes is to setup a mailing list only you have access to, send emails to the list, and use a compatible mail client to send the unsubscribe request.
List-Unsubscribe is a XenForo feature, not a feature of this add-on. That being said, admin.php?dbtech-mail/logs/subscriptions/ is the subscribe/unsubscribe log for DB Mail mailing lists.
If you mean the list when you open the currency overlay, that can't be customised at this time without template edits. You can open dbtech_credits_currency and find <xf:macro id="dbtech_credits_currency_macros::richest" add after arg-limit="10" to show 10 users.
Can you show me a screenshot of the query in the debug view, including the full stack trace (in a separate screenshot if necessary)?
I have a suspicion of what might be the cause, but with the above info I'll be able to tell for certain :)
I have not received any reports about scalability issues that I can recall 🤔 If you can, enable debug mode for your user only (method depends on how you run XF, and there might be addons for it) and check the SQL queries for any slow queries.