> Is there any "security" software running on your Mac? I've seen this sort of thing caused by that, but not in general.
> I ran the two line test and it had no delay at all. The Mac doesn't check for notarization on shell scripts or any non-bundle executable. I just did it again with a new test2.sh and Wireshark capture and there is nothing.
> I do a lot of Keychain code and I've also never seen those delays. The reason I suspect they told you not to use that API is that it's in the "legacy" macOS keychain. They really want everyone to move to the modern keychain but lots of people, myself included, still need the older macOS specific features.
> I'm not saying you are crazy, but all of these things though are the trademark reek of kernel level security software that is intercepting and scanning every exec and file read on the system. We had an issue with Cisco AMP once that took Xcode builds from under 10 seconds to over 5 minutes until we were able to get it fixed.