laggy issue of code editor in R2018b

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Yan Zhang
Yan Zhang 2018-9-30
评论： Jonas Hofbauer 2022-4-23
I am using Macbook Pro 2014. 2.6Ghz i5 processor, 8GM 1600Mhz memory. I installed two versions of matlab, 2015a and 2018b. When I edited my codes in 2015a, everything is fine. However, running 2018b on the same machine, the code editor is very laggy. By "laggy", I mean when I simply tried to move the cursor or type some texts, it may respond after 1-2 seconds. Sometimes, the left bottom corner popped out info "processing...". I didn't see this info in the previous matlab version. Is the new version running something new in the back to cause this laggy issue? Am I the only one having this problem?
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Josh Parks
Josh Parks 2018-10-1
I'm having the same issue with a MacBook Pro 2015. 2018a has no issues
Yan Zhang
Yan Zhang 2018-10-2
Thanks,guys! Someone tested it on macbook pro 2018 and it was fine there. I guess I'll simply go back to R2018a.

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回答（4 个）

Kris Fedorenko
Kris Fedorenko 2018-10-3
编辑：Kris Fedorenko 2018-10-3
There were instances of similar behavior in R2018b caused by the Magnet app. Turning it off should resolve the issue. Alternatively, you should be able to use keyboard shortcuts with no delays.
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Josh Carlile
Josh Carlile 2021-1-19
Quitting magnet solved the problem. Fantastic find!
I haven't seen any way to opt-out Matlab from Magnet but if anyone has suggestions please share
Jonas Hofbauer
Jonas Hofbauer 2022-4-23
When Matlab is open, you can go into the Magnet settings via the menu-bar dropdown and tick "Igonre Matlab" – resolved the issue for me!

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Fan Zhang
Fan Zhang 2019-6-27
I encoutered the same problem on both r2018b and r2019a. The solution is to turn off Magnet.
Hope it helps.
Daniel Pantea
Daniel Pantea 2018-10-22
编辑：Daniel Pantea 2018-10-22
Seems not only MAC is affected. I have same delays in Windows 7 x64. Tested same script and: - with R2018b it needed 23.4s to process the data. - with R2018a it needed 17.21s to process the same data. I have to go back to R2018a as in some situations the display gets unresponsive for seconds with R2018b! Hope they come with some patches, else this is a step back...
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Yan Zhang
Yan Zhang 2018-10-22
Thanks, Daniel, for this very detailed test! Apparently there are other people having this issue. Below is another related post:
https://www.mathworks.com/matlabcentral/answers/421446-r2018b-runs-very-slow-on-macos-10-14?s_tid=answers_rc1-2_p2_BOTH
I didn't get to test the running time for some script because the laggy issue of typing text in the script already stops me from doing that. Some people solve the problem by turning of the Magnet app. But some people have the same issue when they are not window splitting app installed. Hope they can come up with a fix.
Daniel Pantea
Daniel Pantea 2018-10-25
I got great help from support and they identified a place of optimization which reduced the consumed time about 10 times! Details are below and after that the elapsed time difference from 2018b vs 2018a was insignificant:
  • 17a: 1.931015 seconds.
  • 18a: 2.253766 seconds.
  • 18b: 2.268560 seconds.
Here's detail of the improvement (which are specific to my case) I received from support:
Around line 775 in the SCRIPT.m, there is a very tight loop:
for i = 1:N1
k = min(i, mean_len);
my_mean = (my_mean*(k-1)+hUI.preprocessed{1}{ch}(i)) / k;
hUI.preprocessed{3}{ch}(i) = my_mean;
end
Using temporary variables to hoist some of the indexing out of the loop will make a huge difference:
tempVar3 = hUI.preprocessed{3}{ch};
tempVar1 = hUI.preprocessed{1}{ch};
for i = 1:N1
k = min(i, mean_len);
my_mean = (my_mean*(k-1)+tempVar1(i)) / k;
tempVar3(i) = my_mean;
end
hUI.preprocessed{3}{ch} = tempVar3;

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Yan Zhang
Yan Zhang 2019-1-23
For anyone who is still interested, I updated my OS to Mojave (10.14.2) and the laggy issue of R2018b disappears.

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