Extremely long delay when opening a Simulink model with UDP block (Instrument Control Toolbox)

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Hi all,
I have the following problem: When I try to open a Simulink model with an UDP receive or send block (from the Instrument Control Toolbox) for the first time after starting Simulink, I have to wait over 30 minutes until the program show ready. After this first launch, I can work with the model without any problems. The problem still persists after reinstalling Matlab and Simulink. During the startup time, I can see in the task manager that Matlab is using 35 % of the CPU power. There are two processes from type "Java Chromium Embedded Framework (JCEF) Helper" and two from type "Matlab 2020a". I think it is a problem with the "Instrumental Control Toolbox" because I only have this problem when I use blocks from it.
Does someone else also have this problem and how can it be solved?
MATLAB Version: (R2020a)
Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 18362)
Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
Instrument Control Toolbox Version 4.2 (R2020a)
  1 Comment
VIJAY KUMAR DUBEY on 27 Jan 2021
I have got the same problem after simulation. Since matlab 2020 requires more than 8GB of RAM, the problem must be associated with the RAM. I hope after increasing the RAM of your system, the problem will automatically dissolved

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Accepted Answer

sven lack
sven lack on 19 Mar 2021
Hello and thanks for the answers but they don't solve my problem. I am now using Matlab 2020b on a computer with 16 GB of RAM, I7-7500U CPU and still the same problem. A simple model with just a UDP receive block takes 3 minutes to load (when I open it for the first time, if I close the model and open it again, it takes half as long). Java is up to date and I don't have prescan installed.
So, I think the best solution to the problem is to use udp blocks from other libraries (e.g. DSP toolbox). The same Model with a UDP receive block from the DSP toolbox takes less than a second to load on my system.

More Answers (5)

Longfrei Bai
Longfrei Bai on 28 Sep 2021
I have the same issue with 2021b...

Tim on 14 Jul 2022
I have the same problem, usually triggered by plotting within a live script .mlx

David Truscott
David Truscott on 19 Jul 2022
Same problem!

Jiajun Ma
Jiajun Ma on 2 Mar 2021
Hi Sven.
I have encoutered the same issue.
After updating my Java to latested version and reboot my computer.
The problem is solved.

cui on 6 Jul 2022
Edited: cui on 18 Aug 2022
R2022a have the same issue... MATLAB Takes up too much memory
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