Slow to open certain file

[Peter Bienstman]

Opening this file takes more than 10 seconds:

https://www.dropbox.com/s/tg7pr6tetlh7jwb/toc%2020200922%2007.00.01.org?dl=0

I also attach the profile.

I have org files which are much bigger, and they open almost instantly.

This is on Windows 10, emacs 26.3, all packages updated to the latest version.

Is there anything I can do to speed this up?

Thanks!

profile.png
Description: PNG image