Why did linux mint 18 take a long time to load? How to fix?

Question

linux

After some manipulations (already forgot), linux mint 18 began to load for a long time, the desktop loading time was about 3 minutes? Help find the problem.

Answer 1

systemd-analyze plot > /tmp/startspeed.svg && firefox /tmp/startspeed.svg
will create and open in the browser a graph / picture /tmp/startspeed.svg
where everything can be clearly seen

Answer 2

View dmesg output after download