Comment 39 for bug 1873628

Found them, fonts-noto-*,esp. these, in order of causing more hangs:

Get:1 http://us.archive.ubuntu.com/ubuntu groovy/main amd64 fonts-noto-cjk all 1:20190410+repack1-2 [55.7 MB
Get:2 http://us.archive.ubuntu.com/ubuntu groovy/universe amd64 fonts-noto-extra all 20200323-1build1 [68.8 MB]
Get:6 http://us.archive.ubuntu.com/ubuntu groovy/universe amd64 fonts-noto-ui-extra all 20200323-1build1 [11.9 MB]
Get:3 http://us.archive.ubuntu.com/ubuntu groovy/universe amd64 fonts-noto-ui-core all 20200323-1build1 [1,326 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu groovy/universe amd64 fonts-noto-hinted all 20200323-1build1 [3,992 B]
Get:7 http://us.archive.ubuntu.com/ubuntu groovy/universe amd64 fonts-noto-unhinted all 20200323-1build1 [252 kB]

Collectively the noto fonts occupy 779 MB storage/290 MB download which was a surprise to me!

[A] I tested only the noto fonts installed, removing this whole: ( fonts-freefont-ttf fonts-liberation fonts-liberation fonts-lyx fonts-mathjax fonts-noto-color-emoji fonts-roboto-unhinted fonts-urw-base35 fonts-wine )

The noto-fonts alone caused hangs/lags esp. 1,2,6. Removing 1,2,6 it was better responsive but not super fast compared to no noto-fonts and only the glob in [A] installed...

So I would conclude that larger the package of fonts the more time the menu needs to build a preview for them hence causing the lag. This is in agreement with regional font metapackages which are also large but not that much!