Lag boot progress bar

I see a couple of things that need removing but don't think they have anything to do with the momentary pause during boot which is normal in Catalina.

Uninstall CleanMyMac according to the developer's instructions. There is no need for running any "cleaning", "optimizing", "speed-up" or anti-virus apps on your Mac. Read this user tip for what you need to know to protect your iMac: Effective defenses against malware and other threats - Apple Community   

I'd also uninstall Gemini. Anything from MacPaw is considered akin to malware around here.

I suggest trying step 8 in the following user tip article to see if it can help uncover what the culprits may be.

Ref: Mac Basic Startup Troubleshooting Steps - Apple Community

That's typical with the later systems. It's not a bug. Not sure what it's doing at that point in time but there's nothing abberant about it.

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Right! With my iMac 27" it only takes 25-30 seconds to boot, including the pause so it's no big inconvenience. I take that time to turn on my bluetooth keyboard and mouse.