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Ah yes the editor. Truly you have come of age and walked the path of darkness

I edited my original post to include changing the display protocol from Wayland to X11. Comments by rodw and cornholio were based on the terrible jitter that Wayland induces as shown above.

Note that Kunena has the worst forum editor I've ever used, and it was quite a job to edit those posts and restore the formatting. I wonder if forum posting would increase with forum software that was more user friendly.

Looks a lot better.

One thing that was strange when running a basic config I got a real time error. hmmmmm

ATM the best image I've come across is Joco's rpi5 image rod has on his googledrive, that has a 6.6.54 kernel. It's my choice of the pre-built images.

I installed mate desktop, with 2 cores isolated, watching youtube latency is about 17-18us on my pi.

The good news is switching to X11 is trivial.

You can check the session type:    wayland

Launch Rasp-config command line tool in a terminal:
Arrow down to "Advanced Options", and enter.
Arrow down to "Wayland                 Switch between X and Wayland backends", and enter.
If not on the line that says "W1 X11     Openbox window manager with X11 backend", arrow to it and enter.
The popup should say "Openbox on X11 is active" and have "Ok" highlighted. Enter.
It will return to the main screen. Use left-righ arrows to select "Finish". Enter.
Popup asks if you would like to reboot now, with "Yes" highlighted. Enter.

After reboot:    x11

Now here's the interesting apples to apples comparison. The only difference between these two pre-jitter-optimization baseline latency runs is Wayland vs X11.

Wayland:
 

X11: