Background

I have a number of rules on a number of mailboxes. The vast majority of these do one of two things:

1. If the message matches certain conditions, set the SavedToDEVONthink label tag/keyword—which is mapped in MailMate to a label that exists in both of my Google-powered accounts—and remove another label, AddToDEVONthink, if it is present.

2. If the message matches certain conditions, export it to my drive for processing by other applications.

The accounts in question are a Gmail account with ~54k messages and a Google Workspaces account with ~5k messages.

Problems

Something is causing MailMate to thrash these Google accounts, such that they are both "throttled" nearly constantly. This means that emails aren't being processed timely, the tags that MailMate should be applying or removing aren't showing up correctly in the Gmail interface, and messages are late being exported to my drive.

In addition, it seems like many of my rules are not running on their own currently. I just moved to a new MacBook, and all of my rules came over when I used the Mac OS Migration Assistant to copy information from a Time Machine backup. The rules all run correctly if I manually apply them from the context menu, as in Apply Rules of "Inbox", but they aren't running on their own.

Question

How can I debug this to figure out (1) why my rules aren't running and (2) which rule(s) on which mailbox(es) are being triggered and causing the thrashing? I've tried toggling individual rules on and off, but I haven't been able to isolate either problem that way; it seems to be some combination of rules, perhaps across multiple mailboxes.

Thanks.