Using less memory to look up IP addresses in Mess With DNS

I’ve been having problems for the last 3 years or so where Mess With DNS periodically runs out of memory and gets OOM killed. This hasn’t been a big priority for me: usually it just goes down for a few minutes while it restarts, and it only happens once a day at most, so I’ve just been ignoring. But last week it started actually causing a problem so I decided to look into it. This was kind of winding road where I learned a lot so here’s a table of contents: there’s about 100MB of memory availabl...