![]() I then did the following experiment: I created notebook1, containing 512 cells, each containing a = 2+2 As I began copying these cells to the new notebook, that notebook also began to grind to a halt. That notebook contained a large number of one- or two-line calculation cells at the end that I originally didn't bother copying over to my new notebook, thinking they couldn't possibly be important. ![]() After some experimentation, I discovered that an aspect of my old notebook that I thought completely innocuous appears to be causing the issue. Update: In response to a suggestion from rburing, I looked at the text of my notebook files, which convinced me that there isn't any hidden information that might be causing the problem. Evidently there is some invisible content in the old notebook that is causing issues.Ĭan anyone suggest a work-around that is less cumbersome than what I ended up resorting to? Any ideas as to what might have caused this? This fresh notebook now has essentially the same visible content as the old one, but is much more responsive and loads right away. I finally solved the issue by extracting all input cells by hand and copying them into a fresh notebook. This notebook does not contain any graphics or any particularly large input our output cells. I tried many things to rectify the issue, including restarting the kernel, clearing all outputs, shutting down the kernel and restarting, shutting down the browser, shutting down the machine, and creating a copy of the notebook and running that. ![]() I have notebooks open in other tabs of the same browser window that load instantly and are very responsive. When the notebook is opened in a browser tab, it can take five minutes or more for any of the cells to show up. At some point one of my SageMath Jupyter notebooks became very slow to respond to the mouse and keyboard: mouse clicks now take several seconds to register and keystrokes appear only after a long lag. ![]()
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