Simulink user interface slow

Greetings,

Using MATLAB/Simulink 2019b. The interface while modifying my model can get really slow and laggy. Even just simply clicking, dragging, and resizing. Scrolling the wheel to zoom in/zoom out, along with attaching connections.

Is there anything I can do to increase the performance. My laptop isn't the newest, but it's also not that old. I use 64b windows 10, 64b MATLAB. I'm at 10/16 GB of memory used with MATLAB taking 1.5GB and a constant 15-25% CPU.

I have two models open, and some MATLAB code. Really would appreciate any advice on increasing the general UI performance.

Edit: Restarted MATLAB. without a model open it idles with 0% CPU. When I open the model it "idles" at 10+% CPU. Just having the model open and not interacting with it.

[Adam Buchanan]

Same issue for me using a new Dell XPS15 9500 with an Intel i7-10750H, 16GB of RAM and an SSD drive. The longer simulink is open, the worse the issue gets. I am using version 2020a

[Alon Spinner]

+1!!

and the problem is worse in 2020b

This really needs to be solved

[lburseg]

Hi all,

Have you been able to find a solution to this problem? I also experience Simulink (R2020b) becoming extremely slow over time, making it almost impossible to work efficiently without frequent restarts.

[Jason Gauthier]

Basically, more memory and a new, fast CPU, was the only thing to increase performance.

[Alon Spinner]

Going back to this..

Just saw a great expo video for 2021a, but its useless if can't use the program without major delays.

I have a rather new Nvidia quadro and 32GB of Ram. Also ran on two different computers.

Please Address

[Alon Spinner]

Closing the property inspector while modeling solved the problem for me.

[adam k]

The slow GUI speeds have become an issue.

[Kepler]

I am facing the same issue. My PC is powerful enough (12900K + 64GB ram + RTX3090)

But after every movement I made in simulink (click, move, modify parameter, connect a line, etc), I need to wait more than 10 secs before I can make another movement.

My MATLAB version is 2022a.

[Flavio Rehn]

Same problem here. Closing and reopening the model helps some times.

[Timothy]

Has anyone found a solution?

[Stephan Hochmueller]

Same Problem for me. Editing anything takes around 3 seconds.

• opening a constant (+3sec)
• klicking on the dropdown for datatypes (+3sec)
• ...

This makes working with simulink very combersome!

Any solution?

[Benjamin Thompson]

I am looking for solutions to this. My model has a deep hierarchy of reference models. Sometimes it takes 10 seconds to start running, sometimes it takes 30 minutes. This is with R2019B. My testing with R2021B seemed to show improvement but I have not been able to locate anything in release notes that might suggest where and how this was fixed. My models use large nested busses and S-Functions written in C++. MATLAB often uses 4 GB of memory once the model has loaded and update diagram completed.

Dell laptops and/or Windows are doing all this processor throttling even with the laptop plugged in and sitting on a big laptop fan colling pad. The process getting throttled is the "System Interupts" process. Simulink seems to rely on local network communications for inter-process communications so I am thinking that if maybe too much throttling is happening on the machine it slows MATLAB down to a crawl, especially if you have other competing I/O like antivirus, search indexing, and so on.

Sometimes MATLAB hangs and is unresponsive, possibly because one of its child processes has given up on receiving a response over the socket interface?

[Craig]

Agree this is an urgent issue. Makes me want to go back to R2007b.

[Krzysztof Koska]

I am using 2023b and facing same issue with very slow interface. Especially opening properties for bus selectors runs very slow.

Answer 1

[Guillaume]

Hello,

Old topic but this symptom may be related to a Simulink Data Inspector cache that is too large : this could help

Simulink.sdi.clear

Answer 2

[Udit06]

I was also facing a similar issue. In my case the issue was due to the anti-virus software which was slowing down the Simulink UI. You can try out the following approaches to resolve the issue:

1. Disable the anti-virus software.
2. Add MATLAB to the anti-virus whitelist.
3. Change the anti-virus scans to "scheduled" so they are only performed periodically.

Additionally, I found the following bug report which indicates that the Simulink UI may be slower when connected with a VPN.

https://www.mathworks.com/support/bugreports/3342976

I hope this helps.