I spent most of yesterday, deleting and replacing a bunch of code that was generated by an LLM. For the most part, the LLM's assistance has been great.

For the most part.

In this case, it decided to give me a whole bunch of crazy threaded code, and, for the first time, in many years, my app started crashing.

My apps don't crash. They may have lots of other problems, but crashing isn't one of them. I'm anal. Sue me.

For my own rule of thumb, I almost never dispatch to new threads. I will often let the OS SDK do it, and honor its choice, but there's very few places that I find spawning a worker, myself, actually buys me anything more than debugging misery. I know that doesn't apply to many types of applications, but it does apply to the ones I write.

The LLM loves threads. I realized that this is probably because it got most of its training code from overenthusiastic folks, enamored with tech.

Anyway, after I gutted the screen, and added my own code, the performance increased markedly, and the crashes stopped.

Lesson learned: Caveat Emptor.