Unfortunately, as I used it week after week I kept running into cases where it was really slow or completely unresponsive (with no error message or loading indicator), or where it simply was consuming a lot of resources on my Mac. I got in the habit of waiting a few seconds, giving up, killing the app and restarting it.
To be fair, part of the issue may have been me tunneling to a free Fly.io postgres database, which wasn't particularly fast. I eventually got so frustrated I paid for Postico (a barebones native MacOS app), and couldn't be happier.
I realize it takes a lot of time and expertise to build a complex cross-platform web app that doesn't have memory leaks and performance problems, and I hope Arctype will get better over time (like the VSCode or Slack apps). Looking forward to trying it again at some point.