X11 pauses on FreeBSD 14 that are "fixed" by moving the mouse.

There may be a rather simple fix to this problem, but I've followed any
advice that I can find and it's still easily replicable.

So... X is running.  Plasma is running.  Let's, for a second, start
xscreensaver which will, in turn, when we access the config, start one of
it's hacks for us.  Something with 3d, perhaps.  It's just running in the
little window inside the xscreensaver-config app.

Then we'll sit back to watch it.  Very chunky.  lots of pauses.  Then we
watch it while moving the mouse in lazy circles.  Very smooth... almost
perfect.

This is what I'm seeing.

Config:

Threadripper 2950; 64G RAM, 2x 1T Nvme (zfs), nVidia 2080 RTX, 2 monitors
(3440x1440 and 2560x1440).
FreeBSD 14p4, nvidia binary driver, nvidia binary dri bit.

I've attached a few logs and configs that seem pertinent, and I accept that
this is, in all likelihood a misconfiguration of sorts, I need help seeing
it.