Somethings up.
It took FCP 30 seconds to basically return the first issue (during which time it also wound up downloading some files)
Mar 10 20:05:00 Tower root: Fix Common Problems Version 2021.03.07
Mar 10 20:05:27 Tower nginx: 2021/03/10 20:05:27 [error] 9524#9524: *2394 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 172.16.0.2, server: , request: "GET /plugins/dynamix.plugin.manager/include/ShowPlugins.php?check=0 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "172.16.0.1", referrer: "http://172.16.0.1/Plugins"
Mar 10 20:05:31 Tower root: Fix Common Problems: Warning: Share appdata set to not use the cache, but files / folders exist on the cache drive ** Ignored
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Then in the middle of it there's another 2 minute pause
Mar 10 20:05:54 Tower root: Fix Common Problems: Warning: Deprecated plugin dark.theme.plg ** Ignored
Mar 10 20:07:03 Tower nginx: 2021/03/10 20:07:03 [error] 9524#9524: *2509 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 172.16.0.2, server: , request: "GET /plugins/dynamix.plugin.manager/include/ShowPlugins.php?check=0 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "172.16.0.1", referrer: "http://172.16.0.1/Plugins"
Mar 10 20:07:52 Tower root: Fix Common Problems: Warning: Docker application marcvidalmartinez has moderator comments listed
And then it finally finished
Mar 10 20:11:08 Tower root: Fix Common Problems: Other Warning: Background notifications not enabled
6 minutes to run something that should only require maybe 20 seconds.
In the middle of all of this you checked for plugin updates (20:05:03) and it timed out at 20:07:03
How is the speed on plugin checks if you go to Notification Settings - Disable Check for plugin updates, then Plugins and Press Check for Updates?
You've got it in Network settings 3 times. Once is enough, and the others should point to alternatives in case the one fails.