Split-By-Module Very Slow

[automartin5000]

Not sure if this is a duplicate of #680, but running jsii-docgen --split-by-submodule is running incredibly slow for me, on the order of several minutes (sometimes way longer). I don't recall the standard command running that slowly. Is there something different with split-by-submodule that would cause that behavior? Any suggestions on how to debug to see where the bottleneck is?

I'll also note, I do clear the entire docs directory before every run. Otherwise, I believe I could end up with vestigial files if something gets renamed. Would that be impacting?

Also, it's slow both locally and in CI

Hardware: MBP M2 Pro
jsii-docgen: 10.3.13
jsii: 5.3.15
jsii-rosetta: 5.3.3