"Peter Bienstman" <peter.bienst...@gmail.com> writes:

> Is there anything I can do to speed this up? 

Might be a good idea to profile the operation to see where it is 
spending time. Can you:

M-x profiler-start
C-x C-f (or whatever you are doing to open the file)
M-x profiler-report

Here's my output on your file:

https://p.andyklock.com/_CPU-Profiler-Report_2020-09-22_13_27_05_.html

Maybe that will help point you into the right (or at least a) 
direction.

Andy K

REF:
https://www.gnu.org/software/emacs/manual/html_node/elisp/Profiling.html


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