2023b update 5 is slower

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psousa
psousa on 24 Dec 2023
Edited: Benjamin Kraus on 31 Dec 2023
Anyone else having the same issue?
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psousa
psousa on 29 Dec 2023
Update: downloaded the 2024a pre-release and performance is back to 2023b update 4 levels.
Sulaymon Eshkabilov
Sulaymon Eshkabilov on 30 Dec 2023
You can test your computer's performance (along with your updated MATLAB) using builtin benchmarking function from the command window:
>> bench

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Accepted Answer

Benjamin Kraus
Benjamin Kraus on 31 Dec 2023
Edited: Benjamin Kraus on 31 Dec 2023
Update releases include primarily small bug fixes, and as such if they have any impact on the performance of MATLAB, they are likely to only impact specific features or functions, and are very unlikely to cause MATLAB in general to be slower or faster, unless there is some kind of issue with the MATLAB installation.
One thing you could try is a clean installation of MATLAB R2023b Update 5 (rather than an having patched the previous version). It is possible something went wrong with the update process, and a clean installation will resolve the issue.
If a clean installation doesn't help, and you are experiencing an issue that makes MATLAB R2023b Update 5 slower than R2023b Update 4, then it is very likely an issue specifically with something that your code is doing that is running slower due to the update. In order to identify exactly what that is, we would need to see more specific example code, or perhaps profiler results that show the difference between the two MATLAB releases. I recognize that once you've upgraded, getting profiler results from Update 4 would be impossible, but perhaps just showing profiler results for Update 5 would help in identifying what is slower.
You also mentioned that R2024a pre-release resolved the issue, so a profiler comparison between R2023b Update 5 and R2024a pre-release would be informative in identifying any differences.
I think it would also help to give some kind of more quantitative estimate of what you mean by "slower". It doesn't have to be exact, but, for example: "Something that used to take approximately 10 seconds is now taking 100 seconds." vs. "Something that used to take 60 seconds is now taking 61 seconds." Such a statement would help in understanding the issue.
Some additional information is essential if you want to resolve the slowness you are experiencing.
Another option: If you contact technical support, they have ready access to both Update 4 and Update 5. If you can provide them with runnable code that is reliably slower in Update 5, they can easily compare the profiler results between Update 4 and Update 5 to see if the issue is reproducible by someone at MathWorks, and if so they can help to identify the source of the performance regression.

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