Bug: org-tangle writes region for every single block [9.4.4 (9.4.4-elpa @ /home/miha/.config/emacs/elpa/org-20201222/)]

[jakanakaevangeli]

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Tangling a file with a lot of src blocks can get quite slow because
write-region is called for each individual src block.

On my machine it takes 8 seconds to tangle a file with 160 blocks of the
same language. Tangling the file over tramp would probably take about 5
minutes.

Perhaps it would be more optimal to only save each file at the end
of src block extraction.

Emacs  : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, 
cairo version 1.17.3)
 of 2020-08-28
Package: Org mode version 9.4.4 (9.4.4-elpa @ 
/home/miha/.config/emacs/elpa/org-20201222/)