I did a dichotomy and this commit seems to be the culprit:
https://github.com/urwid/urwid/commit/0a664e1afd9653baec2f2fc4331abd59a5a42ded
** Changed in: subiquity (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2089681
Title:
Partition manager navigation terribly slow
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