A lot of X is already stood up by the time the X "weave" background is running.

Maybe do a test by having the X server start and just display an xterm
instead of another X app?
It could be a bunch of stuff hiding in the X init shell script path
that's doing "stuff" as part
of the X env setup before a window manager is run. (and .. honestly it
could even be something
stupid like DNS..)



-a

On Thu, 27 Aug 2026 at 07:19, Mouse <[email protected]> wrote:
>
> >> So, I'm wondering if anyone knows what might be behind this, or has
> >> any suggestions for something to try, or the like.  [...]
> > Maybe a system call trace to see what is slower on the 10.x kernels?
>
> A bit of a sledgehammer, but, yes, I may eventually resort to that.  At
> present I don't even know whether the slowdown is in a syscall, though
> it seems likely since a 9.x X server talking to the same hardware
> without kernel involvement *shouldn't* be any slower.
>
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