Slow login in GDM3

Solution 1:

Judging by your logfile, some extensions seem to block your login process.

For example @ 13:04:30 6 seconds have passed for EasyScreenCast, then another 6 seconds go by for this extension.

You can disable individual extensions via the commandline
looking up the names of the extensisons with

ls ~/.local/share/gnome-shell/extensions

and disabling them with

gnome-shell-extension-tool -d <extension-name>

or from gnome-tewak-tool

enter image description here

You can also go Tabula Rasa and delete all extensions

rm -rf .local/share/gnome-shell/extensions

You can find more infos on handling of extensions on the official gnome3 wiki, here.