Ah, I wanted to reply to my original email. I was wrong.
There's a cancel event that lasts a long time according to Procmon, but it
seems to last as long as the racket executable is running. I don't think
it's the source of any performance problem.
So, yeah... carry on, nothing to see here.
It's good to know that canceling a filesystem-change event can be
expensive on Windows, in which case they probably shouldn't be used on
Windows when resolving module paths. I'll investigate more and remove
Meanwhile, there's not a good way to disable the current use in v6.1,
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