Disable Xorg.0.log

[Beeblebrox]

I seem to have jumped to a conclusion about the problem. More detailed search of /var shows that the largest files created by startx are fontconfig:

/var/db/fontconfig/75ff5e8ddb5aa19e5f229f72d89c73db-le64.cache-4: 461K
/var/db/fontconfig/55cbb48b13195d29d336fd465f155e7b-le64.cache-4: 460K
/var/db/fontconfig/22264dd0cde396d5b420cc5d58df03cf-le64.cache-4: 119K

Apparently, this is what actually fills the MD.
So now I am asking for two solutions...

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FreeBSD_amd64_11-Current_RadeonKMS