topic Re: Fix found: Archicad 28 lagging issues in Modeling

Fix found: Archicad 28 lagging issues

Richard Houlahan — Tue, 18 Mar 2025 05:32:59 GMT

Not a question but rather a solution if anyone has similar problem.

Using Archicad 28 with CI Tools (Aus/NZ) I was modelling a roof using Roof Tile.

I usually use the Shingle Tile cladding but thought the Roof Tile was more accurate for the job.

After applying the cladding anything I tried doing in 2d on a layout like dragging elevation viewports around or dragging text boxes took unbelievably long to click select and drag.

Reverting the roof cladding to the shingle instantly solved the lag problem.

Hope that helps someone with similar issues.

Operating system used: Windows 11 24H2

Re: Fix found: Archicad 28 lagging issues

Barry Kelly — Tue, 18 Mar 2025 06:31:26 GMT

For a shingle, Archicad only has to calculate one flat slab.

For every tile there are many many polygons in 3D and extra lines in 2D.

It may also be defining and calculating the tile fill in 2D.

The less detail you can get away from modelling, the faster Archicad will be.

Barry.

Re: Fix found: Archicad 28 lagging issues

Lingwisyer — Tue, 18 Mar 2025 06:32:36 GMT

Though it should not be redrawing the shingles when moving things around on the Layout without resizing anything?

Re: Fix found: Archicad 28 lagging issues

MitchD — Tue, 18 Mar 2025 06:54:31 GMT

AC28 has made 3D navigation extremely slow i've discovered.

Using the same file in AC26 and AC28; AC26 can load a 3D full of textures, metal cladding, etc. instantly. Open the same file in AC28 and it takes 30-60 seconds to generate.

Even simply unlocking a layer is causing a full 3D regeneration....

Re: Fix found: Archicad 28 lagging issues

MarkT — Fri, 11 Apr 2025 03:48:53 GMT

I'm getting the same insane lag but my roof object is a flat sheet, the profile is controlled by MVO for Elevations & 3D presentation so in normal plan view it's not req'd to have a profile. Also, since installing the latest hotfix 27.3.2 for AC27, I now have the same AC28 lag in AC27. Moving object text can take anywhere between 10-20sec to complete the move. This is getting incredibly frustrating.

PS I should probably add that we've just migrated to cloud licensing which is likely the issue and seems to come with a fair amount of on-line complaints. I believe GS are working on a bugfix if what I've read is correct.

Re: Fix found: Archicad 28 lagging issues

Miha_M — Thu, 15 May 2025 10:43:50 GMT

You can add me to this list. Archicad 28 has become extremely slow. I noticed that the lag becomes much longer with loaded xref files and/or larger terrain polygons, which I mostly place into the project based on public available lidar data or survey data. Maybe also using the survey point for correct geo-location adds some lag-time.

Picking up element properties somehow temporary freezes Archicad. If I move my mouse to the upper edge of my screen it starts responding again. Pasting element properties has the same problem. Zooming in or out is slow and jumpy. I tried everything, but found no solution. I tried to repair the project file, I also started a completly new project file from template and have transfered the basic elements to the new file. I tried to unload some libraries and emptied the embedded library. It's still hard to do my work efficiently.

Migrated to subscription here as well. I did not have the time to follow the recent online complaints and didn't know about this possible issue. If so, then GS must find a solution and issue a fix ASAP!

Re: Fix found: Archicad 28 lagging issues

Ben D — Tue, 28 Oct 2025 04:38:43 GMT

Me too. Since migrating to BIMcloud SaaS and cloud licensing, we have had a whole slew of problems that we never had before - corrupted projects, teamwork issues, extreme performance issues (eg im running a mac M1 Ultra, 64Mb Ram, etc. and just at certain times, doing something as simple as changing the length of a simple wall maxes out all 20 cores for about 15 seconds while I watch the spinning rainbow beachball.)

I really hope they fix this soon.

I have found that one thing that does lead to severe perfomance issues is too many design options.