I see this problem occuring on verizon.com signin page which is keep me from signing in to my account. Note, I have nothing to do with verizon other than being a customer.

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Rewrote it to use a struct passed instead of referencing class properties, now massive fast. Still be nice to know for sure if my conjecture about runtime is true.

This would make sense if the objective-C runtime (or ARC) is still running on Intel, thus requiring a switch to Rosetta. If so, people should be made aware that any capture of self could cause a slowdown on M1. Odd if true, but I can't see how Apple could otherwise code such a simple concept so badly if it's native ARM.