Mac Pro (late 2013) desktop startup slow after Monterey upgrade

I found the issue by taking a stab at reading the report file. I'm ignorant at Code. Though the report mentioned panics related to some old KEXT files. Even though I deleted the old apps affiliated with these files, the KEXT files remained. I used an external startup disc to be able to access these files and simply trash them. All is fine now.

Finally able to see if what you recommend works! I did such with some other tweaks, and it seems it's fine. Though a bigger problem has occurred. When I go to shut down, it moves toward the process though then restarts. I'm now unable to shut down, unless I do a hard-shut with the power button. I performed VRAM & SMC reset. Cleared Power options. Ran Disk Utility and even reinstalled Monterey. To no avail, nothing has worked. Leaving me to have to revert unfortunately back to Big Sur. Monterey, has been a real bummer reminding me of my old PC days of head aches. It's the first OS I've ever had issues with. I believe that it's may be possible that this new Mac "Universal Control" may be the culprit. It's an app in within Coreservices that can't be deleted or turned off. When I use the Activity monitor, it seems to make random spikes to my CPU and my fan works harder with Monterey as well to keep it cool. Bummer. I'm clueless to the real cause.

Thankyou DS13, I’ll give that a go and see how it works upon my return to studio next week. I’ll let you know once I’m able. Cheers :)