Time between Greeter and desktop multiplied by 2

Here are some measurements to compare the boot time betwee 3.14 and bc022ef71e and an X201:

Between syslinux and Tails Greeter: 94 s (3.14) vs 72 s (bc022ef71e): awesome!
Between Tails Greeter and the desktop: 16 s (3.14) vs 26 s: how come it’s almost the double?

Looking for low-hanging fruits to improve this, without revamping our whole MAC spoofing design & implementation, is FT work.

Feature Branch: bugfix/16805-slow-login+force-all-tests

Original created by @sajolida on 16805 (Redmine)

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