The plugin wants to check what features your gdb has. I wonder why this
takes so long. Perhaps there is another gdb argument to do this
quickly?
Do you see the "Reading symbols from" message? You could change the
plugin runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
" Reading symbols might take a while, try more times
let try_count -= 1
Change "1" to a large number, e.g. "100" or "1000".
Let us know if that helps.
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