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Update

Ok, I got it with reproducible example. It turns out size is not the issue, number of cells is.

First, let us programmatically generates a lot cells according to this post. Basically, 3000 cells is enough at least on my computer.

Do[Paste@Cell[BoxData@MakeBoxes@0, "Input"], 3000]

will generate 3000 cells of just 0 then save it. Now test it according to my previous procedure.

Here is another gif show

enter image description here

previous

What I will show you in below gif is that

  1. First, I was in a deep directory C:/0/1/2/3/4/5/6/7/8/9/10 with a relatively large 25.7 MB test.nb contains a lot of stuffs. Open it and press Ctrl+S, take a look at the mouse cursor, we know it freezes for more than 10 seconds.
  2. Then I copy exactly the same nb file to C:/00 do the same thing, the freezing time reduces a lot, only 1 or 2 seconds.

enter image description here

Three problems:

  1. The saving speed depends on directory structure does not make sense to me. Very weird. After all, it is not a too deep directory at all.
  2. Even saving at C:/00, the freeze is also annoying. I still have 12.2 installed, and I do not encounter any freeze when saving in 12.2 no matter where this nb file is.
  3. Any workaround? Or I have to fall back to 12.2 to work with some large nb file.
matheorem
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  • Does it happen (slowing) again when you move it back? – Валерий Заподовников Jul 25 '22 at 04:58
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    @ВалерийЗаподовников You mean copy C:/00 back to deep folder? Of course! the freeze is very robust :) – matheorem Jul 25 '22 at 05:01
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    Have you reported it to the support? They at least should be informed, because the issue is important. – Alexey Popkov Jul 25 '22 at 08:32
  • @AlexeyPopkov Nope yet... I think they could see it here : ) – matheorem Jul 25 '22 at 09:12
  • that happend to me few times, and one time while freezing MMA collaps and when restart again could not open the file due to errors..fortunately file was in Dropbox so I got old version otherwise would be a savere problem. Now working with MMA12.3 more save:-) – MMA13 Jul 25 '22 at 09:52
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    I could not reproduce it (Win10). I was very interested because I have an application the generates thousands of small cells. – Gustavo Delfino Jul 25 '22 at 15:04
  • @matheorem I have retracted my close vote. I can't test your problem now, and I see Gustavo can't reproduce your problem, however, I believe you have provided appropriate tools to at least attempt reproducing your issue, and therefore this should be an on-topic question now. I will delete my obsolete comments (including this one, later) and suggest other people do the same so we keep the discussion useful for future readers. – rhermans Jul 25 '22 at 15:20
  • @rhermans Thank you very much – matheorem Jul 25 '22 at 15:26
  • @GustavoDelfino Thank you so much for testing. That is weird. I am using win11 21H2. Have you tried even more cells? – matheorem Jul 25 '22 at 15:28

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