I do not completely understand the difference between specifying additional packages for a TeXmacs document in the <style> directive vs using the <use-package> macro. They are both mentioned in the documentation, but it seems that it is suggested to use <use-package> inside style files. Is this correct? In any case. Putting <use-package> macros into the preamble causes TeXmacs to become very slow (at least on my windows machine). I actually do not know how I ended up with a file with multiple <use-package> macros in the preamble. However one might want to warn in the manual here

TeXmacs style files (FSF GNU project)

that the <use-package> macro should NOT be used in actual files.

I would like to attach two example .tm files with descriptive names. One is normal while the other one slows texmacs down to a crawl. However the forum is forbidding me from doing so.