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Speed/Display issues/unfamiliar error messages, crashes/hangs or any other problems regarding ARCHICAD (Example: I get an error message when the 3D Window is generated, please help!). <br />Note: If your problem seems to be an ARCHICAD error please always report it to your local reseller!<br />

Moderators: Karl Ottenstein, LaszloNagy, ejrolon, Barry Kelly, gkmethy

Dear ArchiCAD Community.

Before i used AC20 i used AC12. AC12 was very fast compared to vanilla AC20. I could type several keyboard commands in fast order and AC12 did them without hesitation. Panning and zooming was above average. 2D & 3D were fast. Lightworks engine worked without Problem.

After installing AC20 build 3012 i experienced this so often quoted "sluggishnes", and CinreRender did not work, but crashed with the error message "CineRender by MAXON add-on has unexpectedly closed. ArchiCAD schould be restartet".

So i deceided to give at a shot to try and find out what causes this sluggishnes. I used several system monitors and log scriptures to find out what ArchiCAD was doing in the background and what process was causing troubles.

After three Weekends of testing i can give the following Solutions for ArchiCAD 20 build 6005, running on an D / AMD Phenom II X6 1090T 2,0 , 8 GB, Radeon HD 5870, Windows 7 x64, 256 GB Samsung SSD. My AC20 now runs as fast as the old AC12, i might say even a bit faster. The old AC12 was running on the same system configuration by the way.

Getting Rid of Sluggishnes:

Working over a network slows down to a degree, depending on network speed. I use to place the file and folders i am working with on my SSD harddisk drive. . Of course this solution will not work for Teamwork projects.

Speed improvement: moderate but still sluggish

I disabled "Background updating". Whatever ArchiCAD 20 is doing in the Background, logs and monitor show, that it is not very effective and causes a lot of System traffic. It slowed down my AC20.

Speed improvement: moderate but still sluggish

2D & 3D Antialiasing were disabled, 2D hardware acceleration and memory were set to full. Full model for 2D Navigation was set. Automatic renewing of modelsights was also disabled. Of course These actions are pure optional and depending on Hardware.

Speed improvement: significant but still sluggish

Automatic saving was set to all 20min on a local HD Folder. All temporary folders were also set on HD.

Speed improvement: slight but still sluggish

Using a mouse with a polling rate of not over 125 Hz (I use a mouse that allows me to set the polling rate, most mice do not have this option). This was a problem known to Graphisoft with the drawing area screen refreshment rate. It was told me that in build 6005 this problem was adressed and that a high mouse pollin rate does not causes a slowdown anymore. I tested it and it is true.

Speed improvement: significant with AC20 build 3012, none in newer builds, but still sluggish.

Giving ArchiCAD.exe a "High" priority in the "Windows Task Manager".

Speed improvement: slight but still sluggish

Disabling "qtguiagent.exe". There might have been some intern conflict in AC20, systems monitor and log showed considerable traffic sometimes, but since i have a 64bit machine i could disable this process (renamed it qtuiagent.old) without bad side effects. This was done during finding a solution for the Cinerender Problem.

Speed improvement: slight but still sluggish

System monitoring and logs showed, that there was significant traffic with ArchiCAD, its system folders and "MsMpEng.exe". I use Microsoft Security Essentials. So "ArchiCAD.exe" and "ArchiCAD Starter.exe" received exceptions from scanning with MSE. Also all folders and processes concerning ArchiCAD20 received exceptions from scanning with MSE. MSE also was not allowed to scan ist own program folder anymore (Someone in a Forum hinted, that MSE can get clogged down in ist own processes with some programs, so i did this).

Speed improvement: significant , sluggishnes was gone ! This did it for me.

I recommend scanning the excepted folders and files manually from time to time though, as you downgrade System security !

Solving the problem with CineRender:

I tried the solution shown in following topic:
installing Microsoft Visual C++ Redistributable 2012 x86 and x64 and also Intel C++ Compiler for Windows

Effect: Cinerender still crashes

Setting exceptions for all folders, processes and the CinRender.exe in Microsoft Security Essentials.

Effect: Cinerender still crashes

Disabling "qtguiagent.exe" by renaming it in "qtguiagent.old"

Effect: Cinerender still crashes

Allowing my Firewall ( I use COMODO Firewall) all incoming and outgoing traffic of "ArchiCAD.exe" & "CineRender.exe". That was a strange discovery. I usually block all incoming and outgoing traffic with my Firewall (Except local Host or if i want to update etc...). After allowing all outgoing traffic with COMODO, CineRender started to work BUT ONLY, when "ArchiCAD.exe" was STARTED AS ADMINISTRATOR.

Effect: Cinerender works, but you cant drag and drop PDF (Any?) files anymore into ArchiCAD20, this is a side effect of some protection measure from Windows 7 for starting a program as Administrator. I yet have to pinpoint to what IP Adress CineRender or ArchiCAD wants to talk to that caused the problem, but at the moment i am happy as it is.


In my case the sluggishnes and problems were caused to a great part by my own system protection software. Ressource monitoring and system logs showed me where to problems might be. After doing all of the above steps my AC20 works as fast as the old AC12, even a bit faster and CinRender also works at last. I Hope i could help anyone with the descriptions given above. Please excuse an bad grammar. Any feedback is welcome.

Best regards

Thanks for the detailed analysis Dragan.

In item 8 for sluggishness, you mention the Archicad system files.
By this do you mean ...
And … C:\Users\username_here\AppData\Local\Graphisoft
And … C:\Users\username_here\AppData\Roaming\Graphisoft

I am having similar problems with a couple of machines being slow with 20 and so far have had no luck in sorting it out.


Thanks for all this information, I think it is very useful.
I myself started experiencing some slowness in the responsiveness of ARCHICAD 21 recently, despite the fact that I have a brand-new, top of the line desktop computer with ample amount of everything and no weak component.
For example, I noticed that the Info Box took more than a second to populate with all the panels and icons, something that was not the case before.
So I just tried your suggestion about the Antivirus exceptions. I added all GRAPHISOFT-related folders to the Exceptions, even the ones Barry refers to, not only the GRAPHISOFT folder in Program Files.
After this ARCHICAD 21 (build 5021) is really snappy, the Info Box populates in a blink of an eye and generally the program is very responsive to my input. So I think you have probably nailed the source of the sluggishness.

I will forward this topic to GRAPHISOFT Tech Support as well, I am sure they will find it very helpful.

Thank you again for all your research and sharing your findings.
@Barry Kelly

I disallowed MSE from scanning following folders and files:

C:\Program Files\Graphisoft ArchiCAD20
C:\Program Files\Graphisoft ArchiCAD20\ArchiCAD.exe
C:\Program Files\Graphisoft ArchiCAD20\Cinerender\Cinerender.exe

I disallowed MSE from scanning following filetypes:


I disallowed MSE from scanning following processes:

C:\Program Files\Graphisoft ArchiCAD20\ArchiCAD.exe
C:\Program Files\Graphisoft ArchiCAD20\Cinerender\Cinerender.exe
C:\Program Files\Graphisoft ArchiCAD20\ArchiCAD Starter.exe

I also disallowed MSE from scanning its following own files and folders:

C:\Program Files\Microsoft\Microsoft Security Client
C:\Program Files\Microsoft\Microsoft Antimalware
C:\Program Files\Microsoft Security Client
C:\Program Files\Microsoft Security Client\MsMpEng.exe

I set ArchiCAD.exe, ArchiCAD Starter.exe & Cinerender.exe to be started as ADMINISTRATOR (But beware the Drag & Drop problem)

Again you must recognize that you downgrade system security, so take precautions.

Glad i could help you with this. If this problem could be adressed and solved in the future versions of ArchiCAD i would be very glad (And i think not just me).

This was tested on my personal PC i use for Home Office. At work we use iMac OSX 10.12. There the program works faster but i also experienced some Kind of sluggishnes, but not as bad as with the Win 7 Version at first. Big files with a lot of Information tough tend to slow the Mac system down. This problem is gone on my Win 7 PC now, so i think next step is to test some of my findings on the iMacs.

Best Regards