Are there any types you could recommend? I managed to dig up one among some older stuff (my guess is that it is maybe 5-7 years old), but it performed significantly worse. It is a small dongle (like a USB Receiver) and I am sure it was quite cheap.

I use Fluent Reader Lite. Fits my established workflow of consuming RSS-feeds well.

Have they been cross-posting 1:1 between Mastadon and the platform formerly known as Twitter so far?

Cool, I'll check it out. I am not experiencing any issues with Fluent Reader with my use case though.

It's showing up in the list with a bunch of sub-processes that looks like https-requests (I posted the output below). Which logs could I check to learn more about what's happened?

When you say remove the file, do you mean the lock file?