I have the same problem on a MacBook Air M2, updated to Tahoe from Sequoia.
It's so frustrating that a M2 machine can't load instantly a small number of icons!
I noticed this problem also in a brand new M4 MacBookAir updated to Tahoe.
In my computer, the same extremely slow loading issue occurs with the System Settings icons.
I've tried several methods suggested online to speed up the system, but nothing works...
This is completely unacceptable to me, especially since I noticed that this problem doesn't occur on a 2011 MacBook Air, which is more than 10 years older than mine!