I don’t know if related but maybe your issue is not because Agenda. There are a lot of Electron apps which lead to graphical performance issues on all the system on macOS Tahoe. So if you have on your Mac one of these apps, the entire system is sluggy. Maybe Agenda is victim of this bug induced by other apps (Agenda is not an Electron app).
Here a updated list of the fixed and not fixed Electron apps: Shamelectron - Electron Apps macOS Tahoe GPU Performance Tracker
Here more details on performance issues on Tahoe: The Week I Spent Fixing My MacBook’s Post-Tahoe Performance Issues
This is only a theory, I don’t know if this the reason of your issue, but Tahoe is not very well optimized right now…
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You have answered yourself: resizing on the Mac can be slower, because the notes change width in some cases. That requires the text of a bunch of notes to be laid out by the text system, which is expensive. As you say, most notes apps don’t have this issue, because they only show one note.
You will probably find the resizing is faster if you expand the window so the text no longer changes size as you drag. At that point, there is no width change, and it should be fast.
iPad is same: no width change, so fast, though with the new multi-window mode, I think you could probably make it jump a bit too.
That’s the trade off. I guess we could simply hide notes while you resize or something like that, but showing hundreds of notes in a timeline will always have a higher cost than 1.