[Therion] Therion runtime cmd window (+ th2 display) lag on compile with Windows 11

Fri Feb 20 10:30:34 CET 2026

Hi Bruce,

I also observed this lag when my computer was updated to Windows 11. For 
me there is a 6 seconds lag to open the cmd window, but also a 6 seconds 
lag at the end when the cmd window is closed and Xtherion reads the 
output to display it in its interface.  I believe that I was not even 
seing the cmd window before with windows 10 (but I can't go back to check).

However, my main problem is the huge delay (which can be of several 
minutes) for xtherion to display a large th2 file : it take 75 seconds 
to display a th2 of 2500 lines of text (that is 538 commands). During 
that time, xtherion says "Processing commands ...", the advancement bar 
is progressing at the beginning and then the xtherion freezes (not 
always at the same percentage) and is not responding to anything, until 
it finishes eventually. Moving one object from one scrap to another also 
sometimes takes several seconds (in the current example about 5 seconds, 
but I have broken my th2 file in several pieces because it was 
impossible to edit the complete map with all scraps when it was taking 
30 seconds to a minute for a single move !).

I also tried to get back to earlier versions of therion without any 
improvement (I am currently running xtherion 6.3.4 (2025-04-08)). I was 
not really able to figure out what was the source of these changes, 
except that is happened after the update from windows 10 to 11.

Xavier

Le 20/02/2026 à 09:32, bruce at tomo.co.nz a écrit :
>
> Interesting Yann…
>
> Thinking I was imagining this, I opened up my VirtualBox VM copy of my 
> old device running Windows 10.
>
> This VM is poorly configured and typically runs at a glacial pace.  
> Never the less, the lag between clicking compile and the cmd window 
> opening is consistently less than 1 second, more like 0.5 seconds.
>
> It is running XTherion 6.3.4+1f7444ab (2025-08-12).
>
> What could it be that causes a 6 s compile delay on a fast Windows 11 
> device versus a 0.5 s lag on a 10-year-old average Windows 10 device 
> (whether physical or virtual)?
>
> Bruce
>
> *From:*Therion <therion-bounces at speleo.sk> *On Behalf Of *Yann Gardère
> *Sent:* Thursday, 19 February 2026 07:56
> *To:* List for Therion users <therion at speleo.sk>
> *Subject:* Re: [Therion] Therion runtime cmd window lag on compile 
> with Windows 11
>
> hi,
>
> Unfortunately, I’ve always observed this phenomenon on Windows (after 
> 5 years of use), whereas when using Linux (Debian if I remember 
> correctly) on the same PC, it’s like night and day for generation. I 
> don’t have a solution, just my ux
>
> Yann
>
> Le mer. 18 févr. 2026 à 19:48, <bruce at tomo.co.nz> a écrit :
>
>     Does anyone notice a long delay after pressing the compile button
>     in XTherion, before the Therion cmd window starts echoing
>     processing progress?
>
>     Any suggestions as to cause and possible solutions?
>
>     Interested in setups that do and do not exhibit this behaviour.
>
>      Around October last year I swapped out my aging Win10 device for
>     a fast new Win11 device.
>
>     Soon after I noticed that XTherion would ‘hang’ for 5 – 7 seconds
>     before opening the cmd window that echos Therion’s progress
>     through the thconf process.
>
>     It was around the time that changes were being made to the
>     behaviour of the cmd window, circa 6.3.3+ and I loosely attributed
>     the lag in processing to that. Especially since otherwise Therion
>     would process the thconfigs 2x to 10x faster than with my old device.
>
>     I’ve recently being editing projects and needing to compile then
>     every 15 - 30 seconds.  The 6 s lag has become tiresome,
>     especially for small runs that otherwise take less than 1 s!
>
>     Thinking might be a change in Therion I just installed versions
>     back as far as 6.0.5 from around February 2022.
>
>     The problem persisted so I conclude the lag is due to Win11 or
>     something to do with my current device, and not due to Therion.
>
>      I’ve had a browse through Windows Security Smart Application
>     Control and Reputation-based Protection, and disabling likely
>     settings has had no impact.  I’ve tried disabling Virus and Threat
>     Protection settings real-time protection and tamper protection and
>     also no change.
>
>      Bruce
>
>
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-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> INRIA Center at Université Côte d'Azur, Epione project-team, 
> 2004 Route des Lucioles, BP93
> F-06902 Sophia-Antipolis Cedex, France
> +33 4 92 38 76 64
> +33 6 78 35 16 90
> https://team.inria.fr/epione/en/
> -------------------------------

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