By default there are two snap's copies installed: the last one and the previous one. This is to be able to roll back if needed; but it also disturb the system when loading a snap app, and you get chromium for example ( a snap app now) to load/open very slowly. To resolve that problem , simply purge the old version.
https://www.linuxuprising.com/2019/0...s-to-free.html
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