Installation & update
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Archicad 26 is running vey slow on a fast computer


I have a fairly fast Dell XPS computer with 16GB RAM, 1GB SSD, 2TB hard drive, NVIDIA RTS graphics card, all running Win 11. It is running very slowly, taking measurable seconds to respond to Archicad instructions such turning on, and turning off marquees, selecting library parts, etc, etc. I have 783GB of spare space on my SSD and 1.72TB left on my hard drive. The project I am working on is a small house extension.

Where should I start looking?

Cornelis (Kees) Wegman

cornelis wegman architects
AC 5 - 26 Dell XPS 8940 Win 10 16GB 1TB SSD 2TB HD RTX 3070 GPU
Laptop: AC 24 - 26 Win 10 16GB 1TB SSD RTX 3070 GPU

Is this happening to all your files?


Check another project.

Merge the file to a  new file.

Deleting Libraries which are added, one by one .

Repairing the file


Deleting part by part the project, or deleting floors one by one.

There might be a corrupted element somewhere.

Botonis Botonakis
Civil Engineer, Enviromental Design MSc., BIM Manager for BS ArhitectsVR
Company or personal website
Archicad 27. Windows 11. Intel Xeon 2699x2,64 GB RAM, Nvidia 3080Ti. 2 Monitors.
Barry Kelly

Assuming it is just that file having problems?


I would close the file (obviously save if you need to), leave Archicad running.

Go to the FILE menu > Open > then Open again.

Browse for the file and thick the "Open & Repair' option.


If that doesn't fix it, try turning all layers off and turn them back on one (or a few) at a time.

Marquee, view in 3D or do what ever you found was slow.

If it seems fast, turn on some more layers and repeat.

Hopefully that will give a clue where the problem lies.


If it is slow with only one layer on and no other files are affected. then it is something more involved in the file.

Something in the Archicad layer (as it can't be turned off, or maybe Solid Element Operations.

This will be harder to find what the problem is.

If you can try the file on another computer.



One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11

Even if your project is small, if the project management is poor it can kill the performance. There is a very comprehensive guide on how to optimize the project performance on Community here: How to Optimize Your Project Performance

BIM Manager
DKO Architecture - HCMC

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