I wonder if this is related to the xauth timeout because it doesn't know about 
the new Yosemite launchd socket path.  If you launch XQuartz and then do 
'DISPLAY=:0 /path/to/program', does it experience the delay.  Note that your 
DISPLAY may not actually be :0, so if that doesn't work, check what DISPLAY the 
running X server is.

--Jeremy

> On Nov 29, 2014, at 22:06, Tom Lane <[email protected]> wrote:
> 
> Marty Sereno <[email protected]> writes:
>> In XQuartz 2.7.7, running on Mac OS X 10.6.8,
>> the following program (source'd in a wish8.5.12
>> compiled on 10.6.8) takes about 10 milliseconds to
>> finish/display:
> 
>> # display 400 buttons
>> for {set j 0} {$j < 20} {incr j} {
>>   frame .f$j
>>   pack .f$j -side top
>>   for {set i 0} {$i < 20} {incr i} {
>>     button .f$j.b$i -text asdf
>>     pack .f$j.b$i -side left
>>   }
>> }
> 
>> On XQuartz 2.7.7 runnng on Mac OS X 10.10.1,
>> the same program (whether X11 tcl/tk was
>> compiled on 10.6.8 or on 10.10.1) takes
>> about 10 sec to display (1000x slowdown).
> 
> Hm ... I see a similar delay if I run this as a script file,
> but if I copy/paste it into an interactive wish, it seems to be
> about a second or so.  Which is still a lot, but the context
> makes a difference.
> 
> Also, I use exmh (a tcl/tk email handler) constantly, and I've not
> noticed any particular slowdown in it with Yosemite.  So it's not
> true that tk is broken completely.  You'll probably need to do some
> sleuthing ...
> 
>                       regards, tom lane
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