Serious: you should run a profiler on the generation step (or like... for a minute of it and the CTRL-C out). Often times degenerate cases like this exist but a

Serious: you should run a profiler on the generation step (or like... for a minute of it and the CTRL-C out). Often times degenerate cases like this exist but are more or less invisible to maintainers, and just saying "the generator takes forever" is not nearly as actionable as "here's the first 60 seconds of the generation process, does anything look weird?"