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Matlab App Designer editor is very slow

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Robin L.
Robin L. on 2 May 2019
Edited: Adam Danz on 16 Jun 2020
Hello everybody !
I have been developing a software using Matlab App Designer for 2 months, and while my code grows up (~9k lines today), App Designer editor takes more and more times, even for simple tasks, like writing a piece of text, or make a line break...
I tried to untick "Enable app coding alerts", without noticing any significantly change...
I don't have choice to edit my code in another text editor and paste it in Matlab AD..., which is not convenient...
Do you guys have any idea to fix out this issue ?


Robin L.
Robin L. on 2 May 2019
I think this is link to how Matlab AD works : after unzipping and analysing the files created by a new Matlab AD app, I think that each time we type something in the editor, it analyses the entire code and fills system tables containing custom functions, callbacks, 1 line = 1 case, etc... which takes time !
Is there a way to limit that ? I assume this is very safe for a novice, but frustrating for others !
Ajay Kumar
Ajay Kumar on 3 Oct 2019
9k lines are too much in one script. I have a good suggestion.
Try to break down the designer script into some functions and write them in separate .m files and use function calling in designer script.
This makes app designer more efficient.

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Answers (1)

Jared MacDonald
Jared MacDonald on 17 Apr 2020
Hi Robin,
If possible, please update to release R2020a where this has been significantly improved. You can read more details in the MATLAB Release Notes here:
and search for "App Designer" under the Performance section of the R2020a release notes. Switching to code view, typing, entering new lines, etc., have all been improved.

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Adam Danz
Adam Danz on 16 Jun 2020
I face the same problem with r2020a and my app is currently <750 lines including plenty of comment-lines.
When I run the app in debug mode and I try to execute a line manually (highlight it and press F9) it can take several minutes just to run something as easy as ~isempty(app.ListBox.Items). When I try to quit debug mode, it often takes several minutes for that process to complete, too.
This section I'm running in debug mode is within a try/catch block which may or may not contribute to the slowness. It's really really slow most, but not all, of the time when in debug mode. Otherwise, it runs well without any timing issues.

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